TCP SYN (JA4T)

64800_2-4-8-1-3_1400_7

first seen 2026-06-30 00:37 · last seen 2026-09-09 13:16 · 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	`64800`
Option kinds	`2-4-8-1-3`
MSS	`1400`
Window scale	`7`

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
`t12d130600_2d7513195f68_e51b7354d87f`	88
`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
`t13d131100_f57a46bbacb6_ab7e3b40a677` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nr040000_e1d2031bdfea_000000000000_000000000000`	88
`ge20nr12jvid_f8a3a1e39dc3_000000000000_000000000000`	3
`ge11nn12enus_b4d101a026a2_000000000000_000000000000`	1
`ge20nn13jvid_30dc68305204_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`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.	3
`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.	1

TCP SYN (p0f)

fingerprint	co-occurrences
`6:51+13:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	58
`6:47+17:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	17
`6:50+14:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	11
`4:52+12:0:1400:mtu*45,7:mss,sok,ts,nop,ws:df:0`	4
`6:48+16:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	1
`6:45+19:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	1
`6:54+10:0:1400:mss*45,7:mss,sok,ts,nop,ws:flow:0`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 zgrab/0.x`	88
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36`	4
`Mozilla/5.0 (Macintosh; Intel Mac OS X 15_7_9) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.15`	1

Country

fingerprint	co-occurrences
`US` · United States	89
`ID` · Indonesia	4

Network (ASN)

fingerprint	co-occurrences
`AS8075` · Microsoft Corporation	88
`AS24203` · PT XL Axiata	4
`AS53667` · FranTech Solutions	1