TCP SYN (p0f)

4:52+12:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-26 03:03 · last seen 2026-07-13 05:11 · 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

4:52+12:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 52+12 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/153.0.4074.221 Safari/537.36
Observed TTL	52+12 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-07-13

4:52+12:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 52+12 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.4754.172 Safari/537.36
Observed TTL	52+12 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-06-26

4:52+12:0:1380:mss*47,7:mss,sok,ts,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 52+12 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Observed TTL	52+12 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-02

Decomposed attributes

IP version	`4`
Initial TTL	`52+12`
Options length	`0`
MSS	`1380`
Window size	`mss*47`
Window scale	`7`
Options layout	`mss,sok,ts,nop,ws`
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
`t13d1516h2_8daaf6152771_e5627efa2ab1`	8
`t13d131100_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr07enus_3a51d8071d5f_000000000000_000000000000`	4
`ge20nr08enus_16d31f2f9221_000000000000_000000000000`	2
`ge20nn10enus_9673d335a071_000000000000_000000000000`	1
`ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000`	1
`ge20nn09enus_a545420ec371_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	4
`1:65536;3:1000;4:6291456;6:262144\|15663105\|11:1:9:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|9:1:0:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|13:1:0:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|15:1:0:220\|m,a,s,p`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64860_2-4-8-1-3_1380_7`	6

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.4074.221 Safari/537.36`	5
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.4754.172 Safari/537.36`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`RU` · Russia	5
`NO` · Norway	3
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS25532` · LLC MASTERHOST	5
`AS56655` · Gigahost AS	3
`AS62651` · Strong Technology, LLC.	1

fingerprint	co-occurrences
`1:65536;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,a,s,p`	4
`1:65536;3:1000;4:6291456;6:262144\|15663105\|11:1:9:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|9:1:0:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|13:1:0:220\|m,a,s,p`	1
`1:65536;3:1000;4:6291456;6:262144\|15663105\|15:1:0:220\|m,a,s,p`	1