TCP SYN (JA4T)

65535_2-4-8-1-3_1392_6

first seen 2026-07-24 20:45 · last seen 2026-10-31 18:45 · JSON

Last 7 days (198 observations)

Distinct clients per day (last 30 days, peak 107/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
MSS1392
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
t13d4312h1_c7886603b240_b26ce05bbdd6716
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.69
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.47
t13d1517h2_8daaf6152771_b1ff8ab2d16f8
t13d1516h2_8daaf6152771_e5627efa2ab17
t13d4412h1_fd39b124ee10_58ed7828516f4
t13d1515h1_8daaf6152771_0a20fe35d3a52
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
t13d1515h1_8daaf6152771_de4a06bb82e31
t13d1516h1_8daaf6152771_1a63afa7c4781

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.720
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +36 more.The fingerprint page shows the full measured match list. More on the catalog.87
ge20nn12enus_60f823d07c94_000000000000_00000000000021
ge20nr13enus_e2ac93ffb364_000000000000_00000000000017
ge20nr13zhcn_e2ac93ffb364_000000000000_0000000000006
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nr17zhtw_021c223ca66c_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.124
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p7

TCP SYN (p0f)

fingerprintco-occurrences
6:49+15:0:1392:65535,6:mss,sok,ts,nop,ws:flow:070
6:55+9:0:1392:65535,6:mss,sok,ts,nop,ws:flow:064
6:46+18:0:1392:65535,6:mss,sok,ts,nop,ws:flow:057
6:50+14:0:1392:65535,6:mss,sok,ts,nop,ws:flow:052
6:52+12:0:1392:65535,6:mss,sok,ts,nop,ws:flow:047
6:51+13:0:1392:65535,6:mss,sok,ts,nop,ws:flow:047
6:45+19:0:1392:65535,6:mss,sok,ts,nop,ws:flow:043
6:43+21:0:1392:65535,6:mss,sok,ts,nop,ws:flow:040
6:53+11:0:1392:65535,6:mss,sok,ts,nop,ws:flow:037
6:47+17:0:1392:65535,6:mss,sok,ts,nop,ws:flow:035

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36150
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36143
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36132
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.3698
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3673
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.3663
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3654
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.3641
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.3634
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.3621

Country

fingerprintco-occurrences
BR · Brazil243
MX · Mexico111
SA · Saudi Arabia84
TR · Turkey52
JM · Jamaica31
PY · Paraguay30
AR · Argentina23
PH · Philippines23
EC · Ecuador23
MY · Malaysia19

Network (ASN)

fingerprintco-occurrences
AS25019 · Saudi Telecom Company JSC56
AS47331 · TTNet A.S.46
AS17072 · TOTAL PLAY TELECOMUNICACIONES, S.A.P.I. DE C.V.39
AS8151 · Uninet S.A. de C.V.39
AS13999 · Mega Cable, S.A. de C.V.32
AS33576 · Digicel Jamaica31
AS28573 · Claro NXT Telecomunicacoes Ltda29
AS11664 · Techtel LMDS Comunicaciones Interactivas S.A.28
AS8167 · V tal24
AS27775 · Telecommunicationcompany Suriname - TeleSur19

TLS supported groups

fingerprintco-occurrences
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.551
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.64
0a0a,001d,0017,001835
0a0a,6399,001d,0017,00185
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1