TCP SYN (p0f)

6:48+16:0:1432:65535,8:mss,nop,ws,sok,ts:flow:0

first seen 2026-07-16 04:42 · last seen 2026-07-18 09:51 · 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+16:0:1432:65535,8:mss,nop,ws,sok,ts: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/146.0.0.0 Safari/537.36
Observed TTL	48+16 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-07-16

2026-07-18

Decomposed attributes

IP version	`6`
Initial TTL	`48+16`
Options length	`0`
MSS	`1432`
Window size	`65535`
Window scale	`8`
Options layout	`mss,nop,ws,sok,ts`
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
`t13d1514h2_8daaf6152771_a664a5d17759`	2
`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.	1
`t13d1516h2_8daaf6152771_02713d6af862` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.	1
`t12d1515h2_8daaf6152771_4d8a99c1bc01`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr09zhcn_4886f2cdeb15_000000000000_000000000000`	1
`ge20nn13zhcn_0c2c1d640f3e_000000000000_000000000000`	1
`ge20nr09zhcn_b736adc228f1_000000000000_000000000000`	1
`ge20nr10zhcn_c4af0a61f7a7_000000000000_000000000000`	1
`ge20nr08zhcn_429dfdb82413_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;3:1000;4:6291456;5:16384;6:262144\|15663105\|0\|m,a,s,p`	3
`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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-4-8_1432_8`	5

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36`	5

Country

fingerprint	co-occurrences
`CN` · China	5

Network (ASN)

fingerprint	co-occurrences
`AS4134` · CHINANET BACKBONE	5