TCP SYN (JA4T)

65535_2-4-8-1-3_1436_6

first seen 2026-07-17 02:54 · last seen 2026-09-15 06:49 · JSON

Last 7 days (10 observations)

Distinct clients per day (last 30 days, peak 15/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
MSS1436
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
t13d4412h1_fd39b124ee10_58ed7828516f97
t13d1515h1_8daaf6152771_0a20fe35d3a532
t13d1515h1_8daaf6152771_de4a06bb82e326
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
t13d1516h1_8daaf6152771_1a63afa7c4783
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1517h2_8daaf6152771_b1ff8ab2d16f1
t13d2013h1_2b729b4bf6f3_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
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.97
ge11nn13enus_9db22d02e17a_000000000000_00000000000043
ge11nn14enus_4a2973d235de_000000000000_00000000000018
ge20nr13enus_e2ac93ffb364_000000000000_0000000000003
ge20nr13zhcn_e2ac93ffb364_000000000000_0000000000002
ge11nr18engb_7e867ef32ba0_000000000000_0000000000001
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.1

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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.5

TCP SYN (p0f)

fingerprintco-occurrences
4:42+22:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:035
4:43+21:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:028
4:41+23:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:027
4:44+20:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:015
4:45+19:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:013
4:46+18:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:07
4:48+16:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:07
4:47+17:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:06
4:49+15:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:05
4:50+14:0:1436:65535,6:mss,sok,ts,nop,ws:df,id+:05

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.3611
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.367
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.366
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.365
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.364
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.363

Country

fingerprintco-occurrences
UZ · Uzbekistan96
LB · Lebanon10
US · United States9
NP · Nepal9
BR · Brazil7
DO · Dominican Republic5
BD · Bangladesh4
CO · Colombia4
CR · Costa Rica4
AR · Argentina3

Network (ASN)

fingerprintco-occurrences
AS8193 · Uzbektelekom Joint Stock Company96
AS43824 · Masco Group LLC9
AS45650 · VIA NET COMMUNICATION LTD.9
AS11492 · CABLE ONE, INC.6
AS27887 · WIND Telecom S.A.5
AS52228 · Cable Tica4
AS13428 · Surf Air Wireless, LLC2
AS27924 · AMPLIA COMMUNICATIONS LTD.2
AS271936 · SERVICIOS DE TELECOMUNICACIONES ATVCABLE CIA. LTDA.2
AS270020 · T.V. SANV S A S (ALPAVISION HD)2