TCP SYN (p0f)

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

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

IP version4
Initial TTL55+9
Options length0
MSS1380
Window sizemss*31
Window scale13
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
Payload class0

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 (JA4T)

fingerprintco-occurrences
42780_2-4-8-1-3_1380_132

User-Agent

fingerprintco-occurrences
Python/3.12 aiohttp/3.12.152

Country

fingerprintco-occurrences
DE · Germany2

Network (ASN)

fingerprintco-occurrences
AS202412 · Omegatech LTD2