TCP SYN (JA4T)

65535_2-4-8-1-3_1336_8

first seen 2026-09-16 18:11 · last seen 2026-09-16 18:11 · JSON

Decomposed attributes

TCP window65535
Option kinds2-4-8-1-3
MSS1336
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
t13d1517h2_8daaf6152771_e6dcd7ae0a9e Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.3

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn11ruru_3901d4197baf_000000000000_0000000000003

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
6:54+10:0:1336:65535,8:mss,sok,ts,nop,ws:flow:03

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:155.0) Gecko/20100101 Firefox/155.03

Country

fingerprintco-occurrences
RU · Russia3

Network (ASN)

fingerprintco-occurrences
AS12389 · PJSC Rostelecom3