TCP SYN (p0f)

4:56+8:0:1460:65535,0:mss:df,id+:0

first seen 2026-06-12 03:02 · last seen 2026-06-16 15:48 · 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

4:56+8:0:1460:65535,0:mss:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 56+8 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/145.0.0.0 Safari/537.36
Observed TTL	56+8 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-16

Decomposed attributes

IP version	`4`
Initial TTL	`56+8`
Options length	`0`
MSS	`1460`
Window size	`65535`
Window scale	`0`
Options layout	`mss`
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_d8a2da3f94cd`	2

HTTP request (JA4H)

fingerprint	co-occurrences
`po11nr15enus_69cd38b0450c_000000000000_000000000000`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	2

Network (ASN)

fingerprint	co-occurrences
`AS14618` · Amazon.com, Inc.	2