TCP SYN (p0f)

4:50+14:0:1400:mss*44,8:mss,nop,ws:df,id+:0

first seen 2026-07-23 20:51 · last seen 2026-07-23 20:51 · 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

4:50+14:0:1400:mss*44,8:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/…

User-Agent claims Windows

TCP SYN initial TTL 50+14 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 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.87 Safari/537.36
Observed TTL	50+14 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-23

Decomposed attributes

IP version	`4`
Initial TTL	`50+14`
Options length	`0`
MSS	`1400`
Window size	`mss*44`
Window scale	`8`
Options layout	`mss,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
`t12d190800_d83cc789557e_7af1ed941c26`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr05zhcn_c1359f3e48ac_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-1-3_1400_8`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.87 Safari/537.36`	1

Country

fingerprint	co-occurrences
`CN` · China	1

Network (ASN)

fingerprint	co-occurrences
`AS4134` · CHINANET BACKBONE	1