TCP SYN (JA4T)

64240_2-1-1-4_1440_00

first seen 2026-06-30 05:29 · last seen 2026-11-01 13:58 · JSON

Last 7 days (26 observations)

Distinct clients per day (last 30 days, peak 3/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	`2-1-1-4`
MSS	`1440`
Window scale	`00`

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
`t13d2013h2_2b729b4bf6f3_e24568c0d440` Match?Exact match in Thumbprint's published controlled catalog captures: winhttp 10.0.20348.1.The fingerprint page shows the full measured match list. More on the catalog.	421
`t13d1013h2_01be160bb49b_e24568c0d440`	7
`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.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn060000_0c07ec02b430_000000000000_000000000000`	428
`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

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:10485760\|10420225\|0\|m,p,a,s` Match?Exact match in Thumbprint's published controlled catalog captures: winhttp 10.0.20348.1.The fingerprint page shows the full measured match list. More on the catalog.	428
`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
`4:114+14:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	127
`4:112+16:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	103
`4:113+15:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	99
`4:110+18:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	37
`4:109+19:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	24
`4:111+17:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	18
`4:108+20:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	14
`4:107+21:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	2
`4:105+23:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	1
`4:106+22:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36`	428
`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`	1

Country

fingerprint	co-occurrences
`US` · United States	428
`RO` · Romania	1

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	428
`AS8708` · DIGI ROMANIA S.A.	1

TLS supported groups

fingerprint	co-occurrences
`0018,0017` Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.7, powershell 5.1.26100.33648, curl 8.21.0.The fingerprint page shows the full measured match list. More on the catalog.	61