TCP SYN (JA4T)

64240_2-4-8-1-3_1452_8

first seen 2026-07-16 03:40 · last seen 2026-10-24 19:32 · 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	`2-4-8-1-3`
MSS	`1452`
Window scale	`8`

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
`t13d4312h1_c7886603b240_b26ce05bbdd6`	4
`t13d1516h2_8daaf6152771_02713d6af862` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d3013h1_1d37bd780c83_ecd0401ec68b`	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.	4
`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, +39 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge11nn040000_66d37a417839_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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:51+13:0:1452:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1
`4:49+15:0:1452:mss*44,8:mss,sok,ts,nop,ws::0`	1
`4:44+20:0:1452:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1
`4:54+10:0:1452:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1
`4:50+14:0:1452:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1
`4:46+18:0:1452:mss*44,8:mss,sok,ts,nop,ws:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36`	1
`Python/3.13 aiohttp/3.14.1`	1

Country

fingerprint	co-occurrences
`ID` · Indonesia	4
`ES` · Spain	1
`HR` · Croatia	1

Network (ASN)

fingerprint	co-occurrences
`AS7713` · PT Telekomunikasi Indonesia	3
`AS3352` · TELEFONICA DE ESPANA S.A.U.	1
`AS139994` · PT XL Axiata Tbk	1
`AS5391` · Croatian Telecom Inc.	1

TLS supported groups

fingerprint	co-occurrences
`001d,0017,001e,0019,0018,0100,0101,0102,0103,0104` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`0a0a,11ec,001d,0017,0018` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	1