TCP SYN (p0f)

4:112+16:0:1344:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-06-17 08:19 · last seen 2026-06-17 08:20 · 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

4:112+16:0:1344:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:0

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.…

User-Agent claims Linux

TCP SYN initial TTL 112+16 indicates Windows

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 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Observed TTL	112+16 (observed + path distance → initial)
Claimed OS	Linux
Confidence	low — single sighting of an environmental signal

low

2026-06-17

Decomposed attributes

IP version	`4`
Initial TTL	`112+16`
Options length	`0`
MSS	`1344`
Window size	`mss*44`
Window scale	`8`
Options layout	`mss,nop,ws,nop,nop,sok`
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
`t13d311100_1d947a95fc68_b72e173852fa`	2

HTTP request (JA4H)

fingerprint	co-occurrences
`ge10nr030000_0db47b7d240d_000000000000_000000000000`	1
`ge10nn07ruru_c733d08bdfb0_000000000000_000000000000`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36`	2

Country

fingerprint	co-occurrences
`PL` · Poland	2

Network (ASN)

fingerprint	co-occurrences
`AS12912` · T-Mobile Polska S.A.	2