TCP SYN (p0f)

4:49+15:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-20 09:28 · last seen 2026-09-08 04:16 · 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

4:49+15:0:1460:65535,10: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 49+15 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/149.0.0.0 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	medium — repeated co-occurrence, but initial TTL is environmental — capped at medium

medium

2026-06-26

4:49+15:0:1460:65535,10: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 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-01

2026-09-08

4:49+15:0:1460:65535,10: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 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-09-06

4:49+15:0:1460:65535,10: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 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-09-03

4:49+15:0:1460:65535,10: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 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/79.0.3945.88 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-25

4:49+15:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWe…

User-Agent claims Windows

TCP SYN initial TTL 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-23

4:49+15:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/…

User-Agent claims Windows

TCP SYN initial TTL 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.93 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-26

4:49+15:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 …

User-Agent claims Windows

TCP SYN initial TTL 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 ADG/11.0.2510 AOLBUILD/11.0.2510 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-29

4:49+15:0:1460:65535,10: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 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-25

4:49+15:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWe…

User-Agent claims Windows

TCP SYN initial TTL 49+15 indicates Unix-like

Full User-Agent	Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36
Observed TTL	49+15 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-30

Distinct clients per day (last 30 days, peak 1/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	`4`
Initial TTL	`49+15`
Options length	`0`
MSS	`1460`
Window size	`65535`
Window scale	`10`
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
`t13d4412h1_fd39b124ee10_58ed7828516f`	12
`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.	4
`t13d1011h1_61a7ad8aa9b6_3fcd1a44f3e3`	2
`t13d361300_018971650b2c_7bc957b68363`	2
`t13d1515h1_8daaf6152771_0a20fe35d3a5`	2
`t13d1515h1_8daaf6152771_de4a06bb82e3`	2
`t13d1812h1_85036bcba153_b26ce05bbdd6`	1
`t13d3113h2_e8f1e7e78f70_ce5650b735ce`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_b223a0ebb0b5_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.	13
`ge11nn13enus_9db22d02e17a_000000000000_000000000000`	4
`ge11nn060000_a5151d48ea71_000000000000_000000000000`	2
`ge11nr040000_8b1ed2202073_000000000000_000000000000`	1
`ge20nr14enus_186438911b7e_000000000000_000000000000`	1
`ge20nn15enus_eb14703c0579_000000000000_000000000000`	1
`ge20nn14enus_186438911b7e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 149.0.7827.53, chrome 149.0.7827.155, chromium 149.0.7827.102, +2 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge20nr13enus_0c2c1d640f3e_000000000000_000000000000`	1
`ge11nn07enus_66cdcf3bf1ab_000000000000_000000000000`	1
`ge20nn030000_ff50983941c1_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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`3:100;4:33554432;2:0\|33488897\|0\|m,p,s,a` Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-4-8-1-3_1460_10`	22

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36`	3
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36`	2
`facebookplatform/1.0 (+http://developers.facebook.com)`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.40 Safari/537.36`	2
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)`	1
`Googlebot`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.36`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	6
`ZA` · South Africa	5
`SN` · Senegal	4
`DE` · Germany	3
`NG` · Nigeria	3
`ML` · Mali	2
`GB` · United Kingdom	1
`FR` · France	1
`KE` · Kenya	1

Network (ASN)

fingerprint	co-occurrences
`AS5713` · Telkom SA Ltd.	5
`AS36352` · HostPapa	3
`AS14593` · Space Exploration Technologies Corporation	3
`AS8881` · 1&1 Versatel GmbH	3
`AS36873` · Airtel Networks Limited	2
`AS8346` · SONATEL-AS Autonomous System	2
`AS22773` · Cox Communications Inc.	1
`AS212238` · Datacamp Limited	1
`AS59711` · HZ Hosting Ltd	1
`AS46516` · HostRoyale LLC	1