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Website evidence · pilot dataset

Does zillow.com fingerprint you?

Fingerprinting indicators observed.

The latest measured scans include canvas drawing and readback by the same script. Some activity was recorded on a challenge page. This is a fingerprinting indicator, not proof of tracking intent or transmission.

Open evidence JSON ↗

All 9 source records are included in the JSON. 2 older runs have no recorded timestamp; missing provenance stays unknown. The tabs show the latest usable homepage measurement for each setup. Later failed attempts remain in the history. Scan scope and methodology ↗

Inside the scan

← All websites

Earlier measurement shown. Review the scan time and subsequent attempts below.

Visitor setup

Draw + readback

4 of 5 signal families observed

Canvas: ObservedWebGL: ObservedAudio: ObservedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Challenge page
Scan time
2026-10-19T02:47:37.480933Z
Browser / scanner
156.0.8078.4 / 0.3

Captured titleAccess to this page has been denied

CanvasDraws text and reads canvas output.11 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 67076
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext2 calls
  • Inline caller recorded
  • https://ri.px-cloud.net/[redacted-challenge]
canvas.getContext2 calls

Frame: https://crcldu.com/bd/sync.html

  • Inline caller recorded
  • https://crcldu.com/bd/auditor.js
canvas.getContext6 calls

Frame: https://www.zillow.com/

  • Inline caller recorded
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141207
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145583
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 192936
  • https://www.zillow.com/[redacted-challenge]
canvas.toDataURL3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141948
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142562
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145267
canvas2d.fillText220 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141890
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142429
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142504
WebGLQueries the graphics environment.6 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

webgl2renderingcontext.readPixels1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 193754
webglrenderingcontext.getExtension2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143064
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143511
webglrenderingcontext.getParameter25 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143652
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145667
webglrenderingcontext.getShaderPrecisionFormat12 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 144361
webglrenderingcontext.getSupportedExtensions1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145295
webglrenderingcontext.readPixels11 calls

Frame: https://www.zillow.com/

  • https://www.zillow.com/[redacted-challenge]
AudioRenders or reads audio samples.4 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

audio.createDynamicsCompressor1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140167
audio.createOscillator1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140050
audiobuffer.getChannelData500 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140452
offlineaudio.startRendering1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140340
FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.20 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.deviceMemory1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172116
navigator.doNotTrack2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172005
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172026
navigator.hardwareConcurrency3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 173521
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179663
  • https://www.zillow.com/[redacted-challenge]
navigator.language1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171890
navigator.languages5 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171941
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172142
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172155
  • https://www.zillow.com/[redacted-challenge]
navigator.maxTouchPoints5 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 160334
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 160358
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 175335
navigator.mimeTypes13 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147070
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147096
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147112
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147144
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178275
navigator.platform2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171916
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 238834
navigator.plugins39 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118262
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118672
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118719
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 156042
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 156057
navigator.userAgent1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179302
navigator.userAgent38 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 51521
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 73837
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 74282
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 79678
  • https://www.zillow.com/[redacted-challenge]
navigator.webdriver1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179302
navigator.webdriver3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147545
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155694
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 189826
screen.availHeight1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167277
screen.availWidth1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167241
screen.colorDepth2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167533
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179633
screen.height2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167200
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179854
screen.pixelDepth2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167478
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179758
screen.width2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167161
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179815
window.devicePixelRatio2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179709
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 194151
Scripts with both text drawing and canvas readback 1

These source URLs appear in both call groups. Aggregated logs do not preserve the full execution sequence or establish the purpose of the collection.

  • https://client.px-cloud.net/[redacted-challenge]
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

Static script signatures

  • https://client.px-cloud.net/[redacted-challenge]PerimeterX · 8 API patterns
  • https://www.zillow.com/[redacted-challenge]PerimeterX · 0 API patterns
Network and worker observations 21 requests
Captured scripts
4
Instrumented frames
9
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • client.px-cloud.net
  • collector-pxhyx10rg3.px-client.net
  • collector-pxhyx10rg3.px-cloud.net
  • crcldu.com
  • dvp.px-cloud.net
  • fonts.googleapis.com
  • fonts.gstatic.com
  • fst-ec.perimeterx.net
  • ift.px-cloud.net
  • www.zillowstatic.com
Other recorded API calls 2
  • document.cookie.read26 calls
  • document.cookie.write9 calls
Source record and integrity
Original source
results/headful/zillow-com-20261019T024737.json
Original file SHA-256
bd1f204eb6fefb52eadac3cb5d28ef01c00d0bd1bf32a07fdac4b7ae94683956

Run ID: headful-bd1f204eb6fe. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (1)

Visitor setup

Draw + readback

4 of 5 signal families observed

Canvas: ObservedWebGL: ObservedAudio: ObservedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Challenge page
Scan time
Not recorded
Browser / scanner
Unknown browser / Unversioned

Captured titleAccess to this page has been denied

CanvasDraws text and reads canvas output.3 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext6 calls
  • Inline caller recorded
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 150127
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 154440
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 198170
  • https://www.zillow.com/[redacted-challenge]
canvas.toDataURL3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 150882
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 151491
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 154134
canvas2d.fillText220 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 150816
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 151358
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 151433
WebGLQueries the graphics environment.6 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

webgl2renderingcontext.readPixels1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 199004
webglrenderingcontext.getExtension2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 151983
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 152407
webglrenderingcontext.getParameter25 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 152515
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 154522
webglrenderingcontext.getShaderPrecisionFormat12 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 153222
webglrenderingcontext.getSupportedExtensions1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 154153
webglrenderingcontext.readPixels11 calls
  • https://www.zillow.com/[redacted-challenge]
AudioRenders or reads audio samples.4 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

audio.createDynamicsCompressor1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 149071
audio.createOscillator1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 148968
audiobuffer.getChannelData500 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 149373
offlineaudio.startRendering1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 149263
FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.18 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.deviceMemory1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178725
navigator.doNotTrack2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178621
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178642
navigator.hardwareConcurrency3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179965
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184748
  • https://www.zillow.com/[redacted-challenge]
navigator.language1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178518
navigator.languages5 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178571
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178758
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178771
  • https://www.zillow.com/[redacted-challenge]
navigator.maxTouchPoints5 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167481
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167505
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 181351
navigator.mimeTypes13 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155866
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155892
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155908
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155945
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 183545
navigator.platform2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178541
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 242187
navigator.plugins39 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 129254
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 129613
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 129659
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 163425
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 163440
navigator.userAgent38 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 64633
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 82578
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 82635
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 88575
  • https://www.zillow.com/[redacted-challenge]
navigator.webdriver3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 156319
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 163173
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 195018
screen.availHeight1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174210
screen.availWidth1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174178
screen.colorDepth2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174424
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184717
screen.height2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174148
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184925
screen.pixelDepth2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174375
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184833
screen.width2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 174119
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184892
window.devicePixelRatio2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 184792
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 199370
Scripts with both text drawing and canvas readback 1

These source URLs appear in both call groups. Aggregated logs do not preserve the full execution sequence or establish the purpose of the collection.

  • https://client.px-cloud.net/[redacted-challenge]
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

Static script signatures

  • https://client.px-cloud.net/[redacted-challenge]PerimeterX · 7 API patterns
  • https://www.zillow.com/[redacted-challenge]PerimeterX · 0 API patterns
Network and worker observations 21 requests
Captured scripts
3
Instrumented frames
Not recorded
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • client.px-cloud.net
  • collector-pxhyx10rg3.px-client.net
  • collector-pxhyx10rg3.px-cloud.net
  • crcldu.com
  • dvp.px-cloud.net
  • fonts.googleapis.com
  • fonts.gstatic.com
  • fst-ec.perimeterx.net
  • ift.px-cloud.net
  • www.zillowstatic.com
Other recorded API calls 2
  • document.cookie.read32 calls
  • document.cookie.write9 calls
Source record and integrity
Original source
results/headful/zillow-com.json
Original file SHA-256
4e0de7e9693e8ccf0a932c71f84f7381a9d917a8ac279b000aa8e50d55f1201d

Run ID: headful-4e0de7e9693e. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Challenge page
Scan time
2026-10-23T01:26:05.879346Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleAccess to this page has been denied

CanvasDraws text and reads canvas output.2 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 73587
canvas.getContext1 calls

Frame: https://www.zillow.com/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.3 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.languages2 calls

Frame: https://www.zillow.com/

  • https://www.zillow.com/[redacted-challenge]
navigator.platform1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 236263
navigator.userAgent5 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 61881
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 79133
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 79189
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 84770
  • https://www.zillow.com/[redacted-challenge]
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

Static script signatures

  • https://client.px-cloud.net/[redacted-challenge]PerimeterX · 9 API patterns
  • https://www.zillow.com/[redacted-challenge]PerimeterX · 0 API patterns
Network and worker observations 20 requests
Captured scripts
2
Instrumented frames
2
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • client.px-cloud.net
  • collector-a.perimeterx.net
  • collector-pxhyx10rg3.px-cloud.net
  • fonts.googleapis.com
  • fonts.gstatic.com
  • ift.px-cloud.net
  • www.zillowstatic.com
Other recorded API calls 1
  • document.cookie.read12 calls
Source record and integrity
Original source
results/headless/zillow-com-20261023T012605.json
Original file SHA-256
5317236ba13864ac17bdeb82dbdad61e24d134cbc515af147757e3d1bbc97592

Run ID: research-5317236ba138. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (6)

Research setup

Draw + readback

4 of 5 signal families observed

Canvas: ObservedWebGL: ObservedAudio: ObservedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Challenge page
Scan time
Not recorded
Browser / scanner
Unknown browser / Unversioned

Captured titleAccess to this page has been denied

CanvasDraws text and reads canvas output.3 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext6 calls
  • Inline caller recorded
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 133583
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 138036
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 181129
  • https://www.zillow.com/[redacted-challenge]
canvas.toDataURL3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 134344
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 134953
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 137710
canvas2d.fillText220 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 134286
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 134818
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 134893
WebGLQueries the graphics environment.6 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

webgl2renderingcontext.readPixels1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 181970
webglrenderingcontext.getExtension2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 135464
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 135918
webglrenderingcontext.getParameter25 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 136054
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 138110
webglrenderingcontext.getShaderPrecisionFormat12 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 136779
webglrenderingcontext.getSupportedExtensions1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 137738
webglrenderingcontext.readPixels11 calls
  • https://www.zillow.com/[redacted-challenge]
AudioRenders or reads audio samples.3 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

audio.createDynamicsCompressor1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 132527
audio.createOscillator1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 132424
audiobuffer.getChannelData500 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 132822
FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.18 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.deviceMemory1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161686
navigator.doNotTrack2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161584
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161605
navigator.hardwareConcurrency3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 162955
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167612
  • https://www.zillow.com/[redacted-challenge]
navigator.language1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161476
navigator.languages5 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161528
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161713
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161727
  • https://www.zillow.com/[redacted-challenge]
navigator.maxTouchPoints5 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 150870
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 150894
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 164454
navigator.mimeTypes9 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 139438
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161956
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161969
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 165617
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 165631
navigator.platform2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161498
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 225260
navigator.plugins19 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161168
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 161189
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 165125
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 165141
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 165173
navigator.userAgent38 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 48626
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 66983
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 67039
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 72515
  • https://www.zillow.com/[redacted-challenge]
navigator.webdriver3 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 139926
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 146105
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 177912
screen.availHeight1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157132
screen.availWidth1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157101
screen.colorDepth2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157327
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167582
screen.height2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157071
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167799
screen.pixelDepth2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157280
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167706
screen.width2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 157045
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167761
window.devicePixelRatio2 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167666
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 182353
Scripts with both text drawing and canvas readback 1

These source URLs appear in both call groups. Aggregated logs do not preserve the full execution sequence or establish the purpose of the collection.

  • https://client.px-cloud.net/[redacted-challenge]
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

No provider or DNS evidence in this record.

Network and worker observations 22 requests
Captured scripts
0
Instrumented frames
Not recorded
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • client.px-cloud.net
  • collector-pxhyx10rg3.px-client.net
  • collector-pxhyx10rg3.px-cloud.net
  • crcldu.com
  • dvp.px-cloud.net
  • fonts.googleapis.com
  • fonts.gstatic.com
  • fst-ec.perimeterx.net
  • ift.px-cloud.net
  • ri.px-cloud.net
  • www.zillowstatic.com
Other recorded API calls 2
  • document.cookie.read32 calls
  • document.cookie.write9 calls
Source record and integrity
Original source
results/headless/zillow-com.json
Original file SHA-256
fbb5157c12f9e91286a2056a588b419f3139ee9d52f7448443ca41c0b7b2b379

The research mode is inferred from the archive folder because this legacy record has no mode field.

Run ID: research-fbb5157c12f9. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Draw + readback

4 of 5 signal families observed

Canvas: ObservedWebGL: ObservedAudio: ObservedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Challenge page
Scan time
2026-10-19T02:39:02.507812Z
Browser / scanner
156.0.8078.4 / 0.3

Captured titleAccess to this page has been denied

CanvasDraws text and reads canvas output.9 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 67076
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext1 calls
  • https://www.zillow.com/[redacted-challenge]
canvas.getContext6 calls

Frame: https://www.zillow.com/

  • Inline caller recorded
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141207
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145583
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 192936
  • https://www.zillow.com/[redacted-challenge]
canvas.toDataURL3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141948
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142562
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145267
canvas2d.fillText220 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 141890
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142429
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 142504
WebGLQueries the graphics environment.6 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

webgl2renderingcontext.readPixels1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 193754
webglrenderingcontext.getExtension2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143064
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143511
webglrenderingcontext.getParameter25 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 143652
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145667
webglrenderingcontext.getShaderPrecisionFormat12 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 144361
webglrenderingcontext.getSupportedExtensions1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 145295
webglrenderingcontext.readPixels11 calls

Frame: https://www.zillow.com/

  • https://www.zillow.com/[redacted-challenge]
AudioRenders or reads audio samples.4 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

audio.createDynamicsCompressor1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140167
audio.createOscillator1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140050
audiobuffer.getChannelData500 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140452
offlineaudio.startRendering1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 140340
FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.20 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.deviceMemory1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172116
navigator.doNotTrack2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172005
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172026
navigator.hardwareConcurrency3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 173521
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179663
  • https://www.zillow.com/[redacted-challenge]
navigator.language1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171890
navigator.languages5 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171941
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172142
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172155
  • https://www.zillow.com/[redacted-challenge]
navigator.maxTouchPoints5 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 160334
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 160358
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 175335
navigator.mimeTypes9 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147070
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172414
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 172427
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178275
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 178289
navigator.platform2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171916
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 238834
navigator.plugins19 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118262
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118672
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 118719
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 171530
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 176457
navigator.userAgent1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179302
navigator.userAgent38 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 51521
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 73837
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 74282
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 79678
  • https://www.zillow.com/[redacted-challenge]
navigator.webdriver1 calls
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179302
navigator.webdriver3 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 147545
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 155694
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 189826
screen.availHeight1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167277
screen.availWidth1 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167241
screen.colorDepth2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167533
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179633
screen.height2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167200
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179854
screen.pixelDepth2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167478
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179758
screen.width2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 167161
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179815
window.devicePixelRatio2 calls

Frame: https://www.zillow.com/

  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 179709
  • https://client.px-cloud.net/[redacted-challenge]line 2 · col 194151
Scripts with both text drawing and canvas readback 1

These source URLs appear in both call groups. Aggregated logs do not preserve the full execution sequence or establish the purpose of the collection.

  • https://client.px-cloud.net/[redacted-challenge]
Providers, script signatures, and DNS 0 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

Static script signatures

  • https://client.px-cloud.net/[redacted-challenge]PerimeterX · 8 API patterns
  • https://www.zillow.com/[redacted-challenge]PerimeterX · 0 API patterns
Network and worker observations 22 requests
Captured scripts
5
Instrumented frames
8
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • client.px-cloud.net
  • collector-pxhyx10rg3.px-client.net
  • collector-pxhyx10rg3.px-cloud.net
  • crcldu.com
  • dvp.px-cloud.net
  • fonts.googleapis.com
  • fonts.gstatic.com
  • fst-ec.perimeterx.net
  • ift.px-cloud.net
  • ri.px-cloud.net
  • www.zillowstatic.com
Other recorded API calls 2
  • document.cookie.read30 calls
  • document.cookie.write9 calls
Source record and integrity
Original source
results/headless/zillow-com-20261019T023902.json
Original file SHA-256
cf899e6d29d5e2a8df3d746f87b49b34318b101173d7bf14fc65b8624423d12b

Run ID: research-cf899e6d29d5. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Scanner error

Scanner error

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Scanner error
Page context
Page not measured
Scan time
2026-10-23T00:21:01.976595Z
Browser / scanner
156.0.8078.4 / 0.4
Scanner error — no usable scan result

The scanner crashed while collecting this page. No usable API results were saved for this setup. A fresh scan is needed; this is not a site-blocking verdict.

Source record and integrity
Original source
results/headless/zillow-com-20261023T002101.json
Original file SHA-256
fda6d0457bacdee0d73e8851d226c6589682e86edffdeb5044f891c199e7b19d

Run ID: research-fda6d0457bac. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-23T00:21:02.066630Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/zillow-com-20261023T002102.json
Original file SHA-256
b0a7fa8a8a0cc149c48a8944dc8f3b639883b83ab2a0a434eeb7fa9108dfb55d

Run ID: research-b0a7fa8a8a0c. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-23T00:38:36.532726Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/zillow-com-20261023T003836.json
Original file SHA-256
e27bd7f71bb461c2d6caf31fc3d49466259f1190120d10354354309baa7dfa8a

Run ID: research-e27bd7f71bb4. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-23T00:50:15.177876Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/zillow-com-20261023T005015.json
Original file SHA-256
b60adfc3836b126cc910de6967a94cde61355e714ea6f77a726af5fcda408fad

Run ID: research-b60adfc3836b. The JSON contains sanitized observations, not the original private scan payload.

Queries, request bodies, cookies, extracted values, raw errors, and session payloads are excluded before publication. The source digest identifies the original private record.

Read the sanitized JSON →