TCP SYN (p0f)

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

first seen 2026-06-26 12:35 · last seen 2026-09-16 03:20 · 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

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128…

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; rv:128.0) Gecko/20100101 Firefox/128.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-23

2026-07-29

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; rv:108.0) Gecko/20100101 Firefox/108.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-16

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-29

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 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	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-14

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 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
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-25

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-11

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20…

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-01

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120…

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-08-08

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/201…

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-14

6:53+11:0:1440:mss*30,9:mss,nop,ws:flow:0

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

User-Agent claims Windows

TCP SYN initial TTL 53+11 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/112.0
Observed TTL	53+11 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-15

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 2/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

IP version	`6`
Initial TTL	`53+11`
Options length	`0`
MSS	`1440`
Window size	`mss*30`
Window scale	`9`
Options layout	`mss,nop,ws`
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
`t12d130600_2d7513195f68_e51b7354d87f`	52

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr040000_e1d2031bdfea_000000000000_000000000000`	51
`ge11nr040000_88d30a62b7ad_000000000000_000000000000`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`43200_2-1-3_1440_9`	51

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0`	2
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/112.0`	1
`Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 Edg/109.0.1518.70`	1
`Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0`	1
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	52

Network (ASN)

fingerprint	co-occurrences
`AS6939` · Hurricane Electric LLC	52