TCP SYN (p0f)

6:47+17:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-27 07:27 · last seen 2026-09-14 01:43 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 6/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	`47+17`
Options length	`0`
MSS	`1440`
Window size	`mss*45`
Window scale	`10`
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
`t13d3112h1_1d947a95fc68_b72e173852fa`	38
`t13d3012h2_1d37bd780c83_882d495ac381` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.20.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d1712h1_ab0a1bf427ad_882d495ac381`	1
`t13d301200_1d37bd780c83_ecd0401ec68b`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn07cscz_62ad33df7c0a_000000000000_000000000000`	34
`ge11nn06cscz_f604b96915d0_000000000000_000000000000`	3
`ge20nn030000_042112399351_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nn030000_1b6b7c27a67b_000000000000_000000000000`	1
`ge11nn06cscz_fcadf6bdaa82_000000000000_000000000000`	1
`ge11nn040000_5b1e8b5f4d2d_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`3:100;4:65536;2:0\|1048510465\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64800_2-4-8-1-3_1440_10`	40

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/)`	38
`Mozilla/5.0`	1
`curl/8.20.0`	1
`trafilatura/2.0.0 (+https://github.com/adbar/trafilatura)`	1

Country

fingerprint	co-occurrences
`CZ` · Czechia	38
`DE` · Germany	1
`CH` · Switzerland	1
`CN` · China	1

Network (ASN)

fingerprint	co-occurrences
`AS43037` · Seznam.cz, a.s.	38
`AS51167` · Contabo GmbH	1
`AS13030` · Init7 (Switzerland) Ltd.	1
`AS7497` · Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)	1