TCP SYN (p0f)

4:40+24:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 22:34 · last seen 2026-10-18 21:54 · 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

4:40+24:0:1460:mss*20,7: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 40+24 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/136.0.0.0 Safari/537.36 (Silvy X Ran)
Observed TTL	40+24 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-07-01

Distinct clients per day (last 30 days, peak 8/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	`40+24`
Options length	`0`
MSS	`1460`
Window size	`mss*20`
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_806a8c22fdea` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.	78
`t13i170900_5b57614c22b0_78e6aca7449b`	6
`t13d1011h1_61a7ad8aa9b6_3a8073edd8ef`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn13enus_0c2c1d640f3e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +36 more.The fingerprint page shows the full measured match list. More on the catalog.	78
`ge11nn030000_341eb0d8946c_000000000000_000000000000`	1
`ge11nn070000_07b5c846fda8_000000000000_000000000000`	1
`ge11nn050000_0c34b9a6def6_000000000000_000000000000`	1
`ge11nn070000_f395b2c4bb38_000000000000_000000000000`	1
`ge11nn050000_e81ae831f766_000000000000_000000000000`	1
`ge11nn070000_fd2827074311_000000000000_000000000000`	1
`ge11nn050000_7c1f178bff36_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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.	78

TCP SYN (JA4T)

fingerprint	co-occurrences
`29200_2-4-8-1-3_1460_7`	85

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36`	78
`libredtail-http`	6
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 (Silvy X Ran)`	1

Country

fingerprint	co-occurrences
`CN` · China	79
`PK` · Pakistan	6

Network (ASN)

fingerprint	co-occurrences
`AS135089` · China Telecom	58
`AS4134` · CHINANET BACKBONE	14
`AS58466` · CHINANET Guangdong province network	7
`AS59257` · CMPak Limited	6

TLS supported groups

fingerprint	co-occurrences
`0a0a,11ec,001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	4