TCP SYN (JA4T)

65535_2-4-8-1-3_1281_8

first seen 2026-09-24 11:41 · last seen 2026-09-24 11:41 · JSON

Decomposed attributes

TCP window65535
Option kinds2-4-8-1-3
MSS1281
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
t13d2012h1_2b729b4bf6f3_36bf25f296df1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
6:44+20:0:1281:65535,8:mss,sok,ts,nop,ws:flow:01

User-Agent

fingerprintco-occurrences
curl/8.21.01

Country

fingerprintco-occurrences
RU · Russia1

Network (ASN)

fingerprintco-occurrences
AS25159 · PJSC MegaFon1