TCP SYN (JA4T)

27800_2-1-3-4-8_1390_6

first seen 2026-07-25 13:41 · last seen 2026-09-04 22:52 · 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 window27800
Option kinds2-1-3-4-8
MSS1390
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
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d1515h1_8daaf6152771_0a20fe35d3a51

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.1
ge11nn14enus_4a2973d235de_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:240+15:0:1390:mss*20,6:mss,nop,ws,sok,ts:df,id+:01
4:241+14:0:1390:mss*20,6:mss,nop,ws,sok,ts:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.93 Safari/537.361

Country

fingerprintco-occurrences
HR · Croatia2

Network (ASN)

fingerprintco-occurrences
AS5391 · Croatian Telecom Inc.2