TCP SYN (JA4T)

64446_2-1-3-1-1-4_1360_8

first seen 2026-08-29 11:54 · last seen 2026-10-21 10:37 · JSON

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 window64446
Option kinds2-1-3-1-1-4
MSS1360
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
t13d1812h1_85036bcba153_b26ce05bbdd63
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

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.3
ge11nr08enus_aea191eebe67_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:118+10:0:1360:64446,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:121+7:0:1360:64446,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01
4:114+14:0:1360:64446,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:77.0) Gecko/20100101 Firefox/77.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
CA · Canada2
US · United States1
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS212238 · Datacamp Limited2
AS3257 · GTT Communications Inc.1
AS174 · Cogent Communications, LLC1

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