TCP SYN (p0f)

4:43+21:0:1440:mss*44,1:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-07 18:59 · last seen 2026-09-17 05:57 · JSON

Last 7 days (2 observations)

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 TTL43+21
Options length0
MSS1440
Window sizemss*44
Window scale1
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
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1516h1_8daaf6152771_1a63afa7c4781

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_0000000000004

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1440_14

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil3
BD · Bangladesh1

Network (ASN)

fingerprintco-occurrences
AS136815 · Md. Moniruzzaman (Rocky) trading as Jhenaidah Broadband & Cyber Point1
AS53052 · MULTIVELOX SERVICOS DE PROVEDOR DE ACESSO A INTERN1
AS262785 · GIGA MAIS FIBRA TELECOMUNICACOES S.A.1
AS262753 · VOCE TELECOMUNICACOES LTDA1