TCP SYN (JA4T)

65535_2-4-8-1-3_1432_2

first seen 2026-08-02 19:59 · last seen 2026-10-10 17:16 · JSON

Distinct clients per day (last 30 days, peak 7/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	`65535`
Option kinds	`2-4-8-1-3`
MSS	`1432`
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
`t13d2013h1_2b729b4bf6f3_e24568c0d440`	26
`t13d3112h2_e8f1e7e78f70_b26ce05bbdd6` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	12
`t13d3013h2_1d37bd780c83_8537cf56674e`	8

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn030000_fe444ad14866_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	26
`ge20nn020000_5594a17e7e7e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	20

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`3:100;4:10485760;2:0\|1048510465\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.	12
`3:100;4:65536;2:0\|1048510465\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	8

TCP SYN (p0f)

fingerprint	co-occurrences
`4:44+20:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	17
`4:43+21:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	14
`4:45+19:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	5
`4:42+22:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	3
`4:46+18:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	3
`4:48+16:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	2
`4:50+14:0:1432:65535,2:mss,sok,ts,nop,ws:df,id+:0`	1
`4:49+15:0:1432:65535,2:mss,sok,ts,nop,ws:id-:0`	1

User-Agent

fingerprint	co-occurrences
`curl/8.21.0`	26
`curl/8.5.0`	12
`curl/8.14.1`	8

Country

fingerprint	co-occurrences
`US` · United States	46

Network (ASN)

fingerprint	co-occurrences
`AS20115` · Charter Communications LLC	23
`AS11427` · Charter Communications Inc	9
`AS33363` · Charter Communications, Inc	7
`AS10796` · Charter Communications Inc	4
`AS20001` · Charter Communications Inc	2
`AS22773` · Cox Communications Inc.	1