TCP SYN (p0f)

6:54+10:0:1390:mss*47,8:mss,nop,ws,nop,nop,sok:flow:0

first seen 2026-06-28 19:35 · last seen 2026-06-28 19:35 · 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

6:54+10:0:1390:mss*47,8:mss,nop,ws,nop,nop,sok:flow:0

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.…

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/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
Observed TTL	54+10 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-28

Decomposed attributes

IP version	`6`
Initial TTL	`54+10`
Options length	`0`
MSS	`1390`
Window size	`mss*47`
Window scale	`8`
Options layout	`mss,nop,ws,nop,nop,sok`
Quirks	`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
`t12d190800_d83cc789557e_16bbda4055b2`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_580a00142f88_000000000000_000000000000`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)`	1

Country

fingerprint	co-occurrences
`BR` · Brazil	1

Network (ASN)

fingerprint	co-occurrences
`AS22085` · Claro S/A	1