TCP SYN (JA4T)

65535_2-4-8-1-3_1368_9

first seen 2026-07-08 03:59 · last seen 2026-09-09 12:45 · JSON

Distinct clients per day (last 30 days, peak 2/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	`1368`
Window scale	`9`

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_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.	2
`t13d1813h2_e8a523a41297_eca864cca44a`	1
`t13d1515h1_8daaf6152771_0a20fe35d3a5`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`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, +23 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`ge20nn010000_379fadc6c8b7_000000000000_000000000000`	1
`ge11nn13enus_9db22d02e17a_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.	2
`1:65536;3:1000;4:6291456;6:262144\|15663105\|1:1:0:256\|m,p,a,s`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`6:50+14:0:1368:65535,9:mss,sok,ts,nop,ws:flow:0`	2
`4:42+22:0:1368:65535,9:mss,sok,ts,nop,ws::0`	1
`4:46+18:0:1368:65535,9: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/136.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`US` · United States	3
`KR` · South Korea	1

Network (ASN)

fingerprint	co-occurrences
`AS6167` · Verizon Business	3
`AS17853` · LGTELECOM	1