TCP SYN (p0f)

4:51+13:0:1460:mss*11,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-07 00:19 · last seen 2026-10-20 09:47 · 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	`4`
Initial TTL	`51+13`
Options length	`0`
MSS	`1460`
Window size	`mss*11`
Window scale	`9`
Options layout	`mss,sok,ts,nop,ws`
Quirks	`df,id+`
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
`t13d1011h1_61a7ad8aa9b6_3fcd1a44f3e3`	7

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr05enus_20ffb2d95d94_000000000000_000000000000`	4
`ge11nr040000_cf1edba2959c_000000000000_000000000000`	3

TCP SYN (JA4T)

fingerprint	co-occurrences
`16060_2-4-8-1-3_1460_9`	7

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; SEOJuice-SearchBot/1.0; +https://seojuice.io/bot`	7

Country

fingerprint	co-occurrences
`DE` · Germany	5
`US` · United States	2

Network (ASN)

fingerprint	co-occurrences
`AS212238` · Datacamp Limited	6
`AS2914` · NTT America, Inc.	1

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, powershell 7.6.8, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	3