TCP SYN (p0f)

4:115+13:0:1456:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

first seen 2026-09-05 13:53 · last seen 2026-09-05 13:53 · 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

4:115+13:0:1456:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) …

User-Agent claims macOS

TCP SYN initial TTL 115+13 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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Observed TTL	115+13 (observed + path distance → initial)
Claimed OS	macOS
Confidence	low — single sighting of an environmental signal

low

2026-09-05

Decomposed attributes

IP version	`4`
Initial TTL	`115+13`
Options length	`0`
MSS	`1456`
Window size	`65535`
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
`t13d1516h1_8daaf6152771_1a63afa7c478`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-4_1456_8`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`UA` · Ukraine	1

Network (ASN)

fingerprint	co-occurrences
`AS47283` · FOP Koval Dmitro Orestovich	1