TCP SYN (JA4T)

65535_2-4-8-1-3_1390_9

first seen 2026-07-30 00:14 · last seen 2026-10-28 05:07 · JSON

Last 7 days (1 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 kinds2-4-8-1-3
MSS1390
Window scale9

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
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
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1515h1_8daaf6152771_de4a06bb82e31
t13d4412h1_fd39b124ee10_58ed7828516f1

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.2
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nn13enus_9db22d02e17a_000000000000_0000000000001
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:43+21:0:1390:65535,9:mss,sok,ts,nop,ws:df,id+:02
4:40+24:0:1390:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:39+25:0:1390:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1390:65535,9:mss,sok,ts,nop,ws:df,id+:01
6:116+12:0:1390:65535,9:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
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; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.6613.85 Safari/537.361

Country

fingerprintco-occurrences
PK · Pakistan2
ZA · South Africa1
TR · Turkey1
BD · Bangladesh1
NG · Nigeria1

Network (ASN)

fingerprintco-occurrences
AS45669 · JPL /LDI IP TRANSIT1
AS24389 · GrameenPhone Ltd.1
AS56167 · PTML1
AS29465 · MTN NIGERIA Communication limited1
AS15897 · Vodafone Telekomunikasyon A.S.1
AS328218 · Wireless Associate Service Providers CC1

TLS supported groups

fingerprintco-occurrences
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