Network (ASN)

AS43037

first seen 2026-07-10 05:12 · last seen 2026-10-30 15:02 · JSON

Last 7 days (53 observations)

Distinct clients per day (last 30 days, peak 12/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

Network name	`Seznam.cz, a.s.`
Domain	`seznam.cz`

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` Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 11.0.31.The fingerprint page shows the full measured match list. More on the catalog.	769
`t13d3112h1_1d947a95fc68_fa269c3d986d`	117
`t13d3113h1_1d947a95fc68_7e1102d2036b`	38

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn07cscz_62ad33df7c0a_000000000000_000000000000`	643
`ge11nn06cscz_f604b96915d0_000000000000_000000000000`	94
`ge11nn07cscz_d4021d63333c_000000000000_000000000000`	92
`ge11nn06cscz_fcadf6bdaa82_000000000000_000000000000`	66
`ge11nn06cscz_a9e98b5c162a_000000000000_000000000000`	29

TCP SYN (p0f)

fingerprint	co-occurrences
`6:43+21:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	407
`6:44+20:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	210
`6:42+22:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	126
`6:45+19:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	73
`6:46+18:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	56
`6:47+17:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	38
`6:41+23:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	13
`6:40+24:0:1440:mss*45,10:mss,sok,ts,nop,ws:flow:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64800_2-4-8-1-3_1440_10`	924

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/)`	924

Country

fingerprint	co-occurrences
`CZ` · Czechia	924

TLS supported groups

fingerprint	co-occurrences
`001d,0017,0018,0019,001e,0100,0101,0102,0103,0104` Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31.The fingerprint page shows the full measured match list. More on the catalog.	127