TCP SYN (p0f)

6:48+16:0:1440:mss*45,8:mss,nop,ws,nop,nop,sok:ecn,flow:0

first seen 2026-09-17 12:20 · last seen 2026-09-17 12:20 · 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

6:48+16:0:1440:mss*45,8:mss,nop,ws,nop,nop,sok:ecn,flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 48+16 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/90.0.4430.85 Safari/537.36
Observed TTL	48+16 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-09-17

Decomposed attributes

IP version	`6`
Initial TTL	`48+16`
Options length	`0`
MSS	`1440`
Window size	`mss*45`
Window scale	`8`
Options layout	`mss,nop,ws,nop,nop,sok`
Quirks	`ecn,flow`
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
`t12d4907h1_730fb1b0ac6a_8587f467d9ea`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr08enus_f7c64dd4d2b3_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64800_2-1-3-1-1-4_1440_8`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS63949` · Akamai Connected Cloud	1