TCP SYN (p0f)

4:44+20:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 11:38 · last seen 2026-06-25 11:38 · JSON

Inconsistencies

User-Agents observed with this fingerprint that contradict what it proves at the wire. all inconsistencies →

fingerprint User-Agent claims wire shows confidence seen first seen last seen

4:44+20:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW…

User-Agent claims Windows

TCP SYN initial TTL 44+20 indicates Unix-like

The initial TTL is set by the sending kernel (64 on Unix-like systems, 128 on Windows) and survives NAT. But VPNs, proxies and tunnels legitimately replace the sending stack, so this check never exceeds medium confidence.

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.4779.120 Safari/537.36
Observed TTL	44+20 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-25

Decomposed attributes

IP version	`4`
Initial TTL	`44+20`
Options length	`0`
MSS	`1380`
Window size	`mss*47`
Window scale	`7`
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
`t13d1516h2_8daaf6152771_e5627efa2ab1`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn10enus_9673d335a071_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.4779.120 Safari/537.36`	1

Country

fingerprint	co-occurrences
`UA` · Ukraine	1

Network (ASN)

fingerprint	co-occurrences
`AS202422` · G-Core Labs S.A.	1