TCP SYN (JA4T)

65535_2-4-8-1-3_1440_7

first seen 2026-07-26 03:34 · last seen 2026-10-19 21:26 · JSON

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 kinds2-4-8-1-3
MSS1440
Window scale7

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
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.3
t13d1515h1_8daaf6152771_0a20fe35d3a52
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d1516h1_8daaf6152771_1a63afa7c4781

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn13zhcn_0c2c1d640f3e_000000000000_0000000000003
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
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
ge11nn14enus_4a2973d235de_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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
6:47+17:0:1440:65535,7:mss,sok,ts,nop,ws:flow:02
4:52+12:0:1440:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1440:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1440:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1440:65535,7:mss,sok,ts,nop,ws:id-:01
6:49+15:0:1440:65535,7:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) 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) Chrome/123.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
CN · China3
GB · United Kingdom1
BD · Bangladesh1
PK · Pakistan1
CI · Côte d’Ivoire1

Network (ASN)

fingerprintco-occurrences
AS58563 · CHINANET Hubei province network2
AS4837 · CHINA UNICOM China169 Backbone1
AS5607 · Sky UK Limited1
AS29571 · Orange Côte d'Ivoire1
AS150732 · Gumati Online1
AS141778 · Dream Internet Services Pvt Ltd1

TLS supported groups

fingerprintco-occurrences
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1