TCP SYN (JA4T)

65535_2-4-8-1-3_1408_8

first seen 2026-08-21 16:34 · last seen 2026-10-28 14:38 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 3/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
MSS1408
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
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.3
t13d1515h1_8daaf6152771_de4a06bb82e33

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000002
ge11nr16zhtw_3dfdba18536b_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1408:65535,8:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1408:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1408:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:41+23:0:1408:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:38+26:0:1408:65535,8:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.362
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 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.6533.73 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.127 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil5
PL · Poland1

Network (ASN)

fingerprintco-occurrences
AS39603 · P4 Sp. z o.o.1
AS53246 · Cyber Info Provedor de Acesso LTDA ME1
AS268374 · Telnet Servicos e Comércio em Informática Ltda.1
AS262638 · G6 Internet1
AS266984 · INFOTEK TELECOM1
AS269349 · P R M TEIXEIRA JUNIOR - ME1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.3