TCP SYN (JA4T)

64240_2-1-3-4-8_1460_8

first seen 2026-07-04 01:17 · last seen 2026-08-30 21:38 · JSON

Distinct clients per day (last 30 days, peak 4/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	`2-1-3-4-8`
MSS	`1460`
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
`t13d2913h1_723694b0fccc_5671b5df5029`	14
`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.	9
`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, +24 more.The fingerprint page shows the full measured match list. More on the catalog.	4
`t12d210700_76e208dd3e22_f28add8e7af0`	3
`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.	3
`t12d2109h1_76e208dd3e22_7af1ed941c26`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr11ruru_835281d8e5d9_000000000000_000000000000`	9
`ge20nr16ruru_94fdc06e0694_000000000000_000000000000`	7
`ge11nn11ruru_835281d8e5d9_000000000000_000000000000`	4
`ge11nn020000_818f42cc3fd7_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.2.0, php-guzzle 8.0.2, +7 more.The fingerprint page shows the full measured match list. More on the catalog.	3
`ge20nr12zhcn_54b4638ab28b_000000000000_000000000000`	2
`ge20nr13ruru_9e2b86631664_000000000000_000000000000`	2
`ge20nn16ruru_94fdc06e0694_000000000000_000000000000`	2
`ge11nr11ruru_b350a6a7c155_000000000000_000000000000`	1
`ge11nn040000_42db7fa4390b_000000000000_000000000000`	1
`ge20nn13zhcn_9519c2577190_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.	11
`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.	3
`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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.	2

TCP SYN (p0f)

fingerprint	co-occurrences
`4:112+16:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	11
`4:109+19:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	9
`4:111+17:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	3
`4:110+18:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	3
`4:114+14:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	3
`4:107+21:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	2
`4:102+26:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	1
`4:119+9:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	1
`4:117+11:0:1460:mss*44,8:mss,nop,ws,sok,ts:df,id+:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1`	7
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36`	3
`Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.0`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36`	3
`Mozilla/5.0 (iPad; CPU OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Mobile/15E148 Safari/604.1`	3
`Mozilla/5.0 (iPhone; CPU iPhone OS 17_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Mobile/15E148 Safari/604.1`	2
`Mozilla/5.0 (Linux; Android 14; SM-S921B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36`	2
`curl/8.13.0`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36`	1
`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

Country

fingerprint	co-occurrences
`RU` · Russia	27
`CN` · China	3
`LT` · Lithuania	3
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS8402` · PJSC "Vimpelcom"	17
`AS209605` · UAB Host Baltic	3
`AS4808` · China Unicom Beijing Province Network	3
`AS39927` · E-Light-Telecom Ltd.	3
`AS42683` · JSC ER-Telecom Holding	3
`AS31257` · Orion Telecom LLC	2
`AS34602` · MEGASVYAZ LLC	1
`AS402506` · Zenixcloud Inc	1
`AS8615` · Central Telegraph Public Joint-stock Company	1

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprint	linked observations
`q13d0311h3_55b375c5d22e_653d80c3fe9d`	2