TCP SYN (JA4T)

42780_2-4-8-1-3_1380_13

first seen 2026-07-27 17:13 · last seen 2026-08-31 20:26 · 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 window42780
Option kinds2-4-8-1-3
MSS1380
Window scale13

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
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_66d37a417839_000000000000_0000000000002

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1380:mss*31,13:mss,sok,ts,nop,ws:df,id+:02

User-Agent

fingerprintco-occurrences
Python/3.12 aiohttp/3.12.152

Country

fingerprintco-occurrences
DE · Germany2

Network (ASN)

fingerprintco-occurrences
AS202412 · Omegatech LTD2