TCP SYN (JA4T)

65535_2-4-8-1-3_1380_8

first seen 2026-07-01 15:48 · last seen 2026-09-15 22:38 · JSON

Last 7 days (2291 observations)

Distinct clients per day (last 30 days, peak 464/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
MSS1380
Window scale8

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
t13d3111h2_e8f1e7e78f70_5ac7197df9d232612
t13d4412h1_fd39b124ee10_58ed7828516f39
t13d1515h1_8daaf6152771_0a20fe35d3a519
t13d1515h1_8daaf6152771_de4a06bb82e313
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
t13d1516h1_8daaf6152771_1a63afa7c4782
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.1
t13d2212h1_3522af84f765_8d633dac71241
t13d2014h2_a09f3c656075_14788d8d241b1
t13d2013h1_2b729b4bf6f3_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_80b089f68b8e_000000000000_00000000000017923
ge20nn09enus_c5abe4666a67_000000000000_0000000000006969
ge20nn020000_e5a56608905c_000000000000_0000000000005730
ge20nn070000_1903711a2262_000000000000_0000000000001448
ge20nn11enus_08fd186dd996_000000000000_000000000000288
ge20nn040000_3dccbaa13f05_000000000000_000000000000165
ge20nn030000_0d4c7aba53a3_000000000000_00000000000059
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.39
ge11nn13enus_9db22d02e17a_000000000000_00000000000025
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.16

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:4096;2:0;5:16384;6:131072;3:100;4:65536|26148865|0|m,s,p,a22451
1:4096;2:0;5:16384;6:131072;3:100;4:65536;11105:65535;11106:65535;11107:65535;11108:10;11109:10|26148865|0|m,s,p,a10161
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
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, +42 more.The fingerprint page shows the full measured match list. More on the catalog.1
4:2097152;3:100|10485760|1:0:0:255|m,s,p,a1

TCP SYN (p0f)

fingerprintco-occurrences
6:56+8:0:1380:65535,8:mss,sok,ts,nop,ws::025364
6:58+6:0:1380:65535,8:mss,sok,ts,nop,ws::03711
6:55+9:0:1380:65535,8:mss,sok,ts,nop,ws::01020
6:46+18:0:1380:65535,8:mss,sok,ts,nop,ws::0686
6:53+11:0:1380:65535,8:mss,sok,ts,nop,ws::0612
6:49+15:0:1380:65535,8:mss,sok,ts,nop,ws::0597
6:47+17:0:1380:65535,8:mss,sok,ts,nop,ws::0131
6:52+12:0:1380:65535,8:mss,sok,ts,nop,ws::086
6:48+16:0:1380:65535,8:mss,sok,ts,nop,ws::084
6:247+8:0:1380:65535,8:mss,sok,ts,nop,ws::063

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))13261
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)8602
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))7339
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))1811
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))1118
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))176
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))74
Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))42
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))42
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36 Edg/146.0.0.0 (compatible; meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))31

Country

fingerprintco-occurrences
US · United States30701
DE · Germany655
SG · Singapore652
GB · United Kingdom610
AE · United Arab Emirates10
KW · Kuwait9
NG · Nigeria9
ZA · South Africa8
EG · Egypt8
LB · Lebanon5

Network (ASN)

fingerprintco-occurrences
AS32934 · Facebook, Inc.32613
AS15802 · Emirates Integrated Telecommunications Company PJSC10
AS47589 · Kuwait Telecommunications Company K.S.C.C.9
AS29465 · MTN NIGERIA Communication limited9
AS8452 · TE-AS5
AS9051 · IncoNet Data Management sal5
AS36994 · Vodacom5
AS11664 · Techtel LMDS Comunicaciones Interactivas S.A.4
AS33771 · Safaricom Limited4
AS38565 · Ncell Pvt. Ltd.3