TCP SYN (p0f)

4:54+10:0:1452:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 17:33 · last seen 2026-07-01 22:33 · 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

4:54+10:0:1452:mss*20,7: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 54+10 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/60.0.3112.113 Safari/537.36
Observed TTL	54+10 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-07-01

Decomposed attributes

IP version	`4`
Initial TTL	`54+10`
Options length	`0`
MSS	`1452`
Window size	`mss*20`
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
`t12d7008h1_0b90a0e79fbd_046e095b7c4a`	3

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr030000_0d34275228c4_000000000000_000000000000`	3

TCP SYN (JA4T)

fingerprint	co-occurrences
`29200_2-4-8-1-3_1452_7`	3

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36`	3

Country

fingerprint	co-occurrences
`DE` · Germany	3

Network (ASN)

fingerprint	co-occurrences
`AS3320` · Deutsche Telekom AG	3