TCP SYN (p0f)

6:45+19:0:1420:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-10-16 22:20 · last seen 2026-10-16 22:20 · 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 version	`6`
Initial TTL	`45+19`
Options length	`0`
MSS	`1420`
Window size	`mss*45`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`flow`
Payload class	`0`

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)

fingerprint	co-occurrences
`t13d3013h1_1d37bd780c83_8537cf56674e`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`he11nn050000_b223a0ebb0b5_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64800_2-4-8-1-3_1420_7`	1

User-Agent

fingerprint	co-occurrences
`python-requests/2.32.3`	1

Country

fingerprint	co-occurrences
`HU` · Hungary	1

Network (ASN)

fingerprint	co-occurrences
`AS20845` · 2Connect Telecommunications Infrastructure & Network Services Ltd.	1

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,001e,0018,0019,0100,0101` Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.	1