TCP SYN (p0f)

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

first seen 2026-06-11 03:04 · last seen 2026-06-23 12:27 · JSON

Inconsistencies

User-Agents observed with this fingerprint that contradict what it proves at the wire. Showing the first 10 here. all inconsistencies →

fingerprint User-Agent claims wire shows confidence seen first seen last seen

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gec…

User-Agent claims Windows

TCP SYN initial TTL 51+13 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 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-06-14

2026-06-21

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-06-12

2026-06-13

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.57
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-16

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit…

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36 SE 2.X MetaSr 1.0
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-13

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-12

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109…

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-13

2026-06-18

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-16

2026-06-23

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

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

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 Edg/125.0.0.0
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-22

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 10.0; rv:108.0) Gecko/20…

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; rv:108.0) Gecko/20100101 Firefox/108.0
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-11

4:51+13:0:1460:mss*29,9:mss,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 10.0.0; Win64; x64; ) Ap…

User-Agent claims Windows

TCP SYN initial TTL 51+13 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0.0; Win64; x64; ) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.6261.156 Not(A:Brand/24 YaBrowser/24.4.1.899 Yowser/2.5 Safari/537.36
Observed TTL	51+13 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-06-23

Decomposed attributes

IP version	`4`
Initial TTL	`51+13`
Options length	`0`
MSS	`1460`
Window size	`mss*29`
Window scale	`9`
Options layout	`mss,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
`t12d130600_2d7513195f68_e51b7354d87f`	50
`t12i130500_2d7513195f68_e51b7354d87f`	8
`t13i030800_55b375c5d22e_97f8aa674fd9`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_88d30a62b7ad_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.	54
`ge11nr040000_88d30a62b7ad_000000000000_000000000000`	5

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36`	3
`Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0`	3
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/135.0.0.0 Safari/537.36`	3
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0`	2
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.0`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0`	2
`Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36 SE 2.X MetaSr 1.0`	2
`Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0`	2

Country

fingerprint	co-occurrences
`US` · United States	59

Network (ASN)

fingerprint	co-occurrences
`AS6939` · Hurricane Electric LLC	59