TCP SYN (p0f)

4:114+14:0:1358:64446,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-19 16:04 · last seen 2026-06-19 16:04 · 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

4:114+14:0:1358:64446,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv…

User-Agent claims macOS

TCP SYN initial TTL 114+14 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; rv:77.0) Gecko/20100101 Firefox/77.0
Observed TTL	114+14 (observed + path distance → initial)
Claimed OS	macOS
Confidence	low — single sighting of an environmental signal

low

2026-06-19

Decomposed attributes

IP version	`4`
Initial TTL	`114+14`
Options length	`0`
MSS	`1358`
Window size	`64446`
Window scale	`8`
Options layout	`mss,nop,ws,nop,nop,sok`
Quirks	`df,id+,ecn`
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
`t13d1812h1_85036bcba153_b26ce05bbdd6`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_608e01151bf4_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:77.0) Gecko/20100101 Firefox/77.0`	1

Country

fingerprint	co-occurrences
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS174` · Cogent Communications, LLC	1