TCP SYN (JA4T)

65535_2-1-3-1-1-8-4-0-0_1280_6

first seen 2026-07-01 15:07 · last seen 2026-10-28 03:30 · JSON

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

TCP window65535
Option kinds2-1-3-1-1-8-4-0-0
MSS1280
Window scale6

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.21.0, node-fetch 24.19.0, node-fetch 22.23.1, +9 more.The fingerprint page shows the full measured match list. More on the catalog.6
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1714h1_5b57614c22b0_43ade6aba3df4
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.4
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1516h2_8daaf6152771_ea2cc3955db72
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog.1
t13d181000_5d04281c6031_78e6aca7449b1
t13d0311h1_55b375c5d22e_3217d83565aa1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn13enau_0c2c1d640f3e_000000000000_0000000000006
ge11nn12enus_83280f7745f9_000000000000_0000000000005
ge11nn050000_5ddb03fb9e99_000000000000_0000000000004
ge20nn13enau_30dc68305204_000000000000_0000000000004
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn050000_2469c960a647_000000000000_0000000000001
ge11nn040000_08e7224bf8c7_000000000000_0000000000001
ge11nn07*000_3022bbb03f71_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +60 more.The fingerprint page shows the full measured match list. More on the catalog.10
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.13.5, rust-reqwest 0.13.4, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:46+18:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:012
4:43+21:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:06
4:47+17:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:02
4:46+18:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:02
4:50+14:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
4:47+17:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01
4:49+15:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01
4:43+21:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.365
OpenAI File Downloader, XaiImageApiFetch/1.05
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/151.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
curl/8.7.11
curl/8.4.01
WhatsApp/21
Claude-User (claude-code/2.1.281; +https://support.anthropic.com/)1

Country

fingerprintco-occurrences
AU · Australia15
HK · Hong Kong SAR China6
AT · Austria2
DE · Germany1
GB · United Kingdom1
ZA · South Africa1

Network (ASN)

fingerprintco-occurrences
AS7545 · TPG Telecom Limited15
AS137816 · Cloud Net Technologies Limited6
AS9009 · M247 Europe SRL2
AS43357 · Owl Limited2
AS20011 · Dimension Data1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.6
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1