TCP SYN (JA4T)

64240_2-4-8-1-3_1452_12

first seen 2026-08-05 13:51 · last seen 2026-10-01 01:55 · JSON

Decomposed attributes

TCP window	`64240`
Option kinds	`2-4-8-1-3`
MSS	`1452`
Window scale	`12`

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.	2
`t13d1517h2_8daaf6152771_cb7bf5808d99` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 156.0.8078.48, chrome 154.0.8037.57, +27 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`t13d1714h1_5b57614c22b0_43ade6aba3df`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_5ddb03fb9e99_000000000000_000000000000`	1
`ge20nr14ruru_6b420da426c9_000000000000_000000000000`	1
`ge20nr15ruru_ed034a4bc9b0_000000000000_000000000000`	1
`ge20nr14ruru_e7d1c4ccda78_000000000000_000000000000`	1
`ge20nr13ruru_4ab217da8a11_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:6291456;6:262144\|15663105\|1:1:0:220\|m,a,s,p` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +85 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`2:0;4:4194304;5:16384;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`1:65536;2:0;4:6291456;6:262144\|15663105\|7:1:0:220\|m,a,s,p`	1
`2:0;4:4194304;5:1048576;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.3, go-net/http 1.27.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:47+17:0:1452:mss*44,12:mss,sok,ts,nop,ws:df,id+:0`	2
`4:49+15:0:1452:mss*44,12:mss,sok,ts,nop,ws:df,id+:0`	1
`4:50+14:0:1452:mss*44,12:mss,sok,ts,nop,ws:df,id+:0`	1
`4:45+19:0:1452:mss*44,12:mss,sok,ts,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36`	4
`understory/0.1 (CT research; https://github.com/0x4b) +contact-via-repo`	1

Country

fingerprint	co-occurrences
`RU` · Russia	4
`TH` · Thailand	1

Network (ASN)

fingerprint	co-occurrences
`AS57378` · JSC ER-Telecom Holding	4
`AS133481` · AIS Fibre	1