TCP SYN (p0f)

4:53+11:0:1340:27520,7:mss,sok,ts,nop,ws::0

first seen 2026-07-08 16:46 · last seen 2026-07-09 19:20 · 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

4:53+11:0:1340:27520,7:mss,sok,ts,nop,ws::0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 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/99.0.4844.51 Safari/537.36 Edg/99.0.1150.30
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-07-08

Decomposed attributes

IP version	`4`
Initial TTL	`53+11`
Options length	`0`
MSS	`1340`
Window size	`27520`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
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
`t13d1516h2_8daaf6152771_d8a2da3f94cd` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`t13d1516h2_8daaf6152771_e5627efa2ab1`	2
`t13d1515h1_8daaf6152771_de4a06bb82e3`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn13enus_0c2c1d640f3e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +39 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`ge20nn12enus_60f823d07c94_000000000000_000000000000`	2
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +60 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`1:65536;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`27520_2-4-8-1-3_1340_7`	6

User-Agent

fingerprint	co-occurrences
`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`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36 Edg/99.0.1150.30`	3

Country

fingerprint	co-occurrences
`US` · United States	6

Network (ASN)

fingerprint	co-occurrences
`AS212238` · Datacamp Limited	5
`AS11878` · tzulo, inc.	1