TCP SYN (JA4T)

64240_2-1-3-1-1-4_1460_2

first seen 2026-08-27 06:06 · last seen 2026-08-30 23:01 · JSON

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

TCP window	`64240`
Option kinds	`2-1-3-1-1-4`
MSS	`1460`
Window scale	`2`

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_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.	2
`t13d1617h2_86a278354501_3cbfd9057e0d` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr16svse_94fdc06e0694_000000000000_000000000000`	2
`ge20nr13frfr_9e2b86631664_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.	2
`1:65536;2:0;4:131072;5:16384\|12517377\|3:0:0:42\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:108+20:0:1460:mss*44,2:mss,nop,ws,nop,nop,sok:df,id+:0`	1
`4:107+21:0:1460:mss*44,2:mss,nop,ws,nop,nop,sok:df,id+:0`	1
`4:112+16:0:1460:mss*44,2:mss,nop,ws,nop,nop,sok:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 Edg/150.0.0.0`	1
`Mozilla/5.0 (Android 13; Mobile; rv:153.0) Gecko/153.0 Firefox/153.0`	1
`Mozilla/5.0 (Linux; Android 13; Pixel 4a) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36`	1

Country

fingerprint	co-occurrences
`SE` · Sweden	2
`FR` · France	1

Network (ASN)

fingerprint	co-occurrences
`AS8473` · Bahnhof AB	2
`AS12322` · Free SAS	1