TLS ClientHello (JA4)

t13d0912h2_f91f431d341e_ab7e3b40a677

first seen 2026-09-23 05:13 · last seen 2026-10-03 04:34 · JSON

Distinct clients per day (last 30 days, peak 1/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

Protocol	`t (TLS over TCP)`
TLS version	`13`
SNI	`d (domain)`
Cipher count	`9`
Extension count	`12`
ALPN	`h2`
Ciphers	`1301, 1302, 1303, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 002b, 0032, 0033, ff01`
Signature algorithms	`0804, 0403, 0807, 0805, 0806, 0401, 0501, 0601, 0503, 0603`
JA4_r	`t13d0912h2_1301,1302,1303,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,002b,0032,0033,ff01_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603`
JA4_o (sample)	`t13d0912h2_8e4c1465eaca_1b1d6b47de61`
JA4_ro (sample)	`t13d0912h2_c02b,c02f,c02c,c030,cca9,cca8,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0032,0010,002b,0033_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603`

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.

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nr14enus_5672ebce0e69_000000000000_000000000000`	1
`ge20nr14enus_5a755a9ed6a7_000000000000_000000000000`	1
`ge20nr14enus_c23b56ba7569_000000000000_000000000000`	1
`ge20nr14enus_e4ef8a2d9eff_000000000000_000000000000`	1
`ge20nr14enus_d71678fddcfd_000000000000_000000000000`	1
`ge20nr14enus_eb194dc3594e_000000000000_000000000000`	1
`ge20nr14enus_45ed866f8aa8_000000000000_000000000000`	1
`ge20nr14enus_2d2f90e9a52e_000000000000_000000000000`	1
`ge20nr14enus_63936dc74a25_000000000000_000000000000`	1
`ge20nr14enus_a9e56bf08cc2_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:4194304;5:16384;6:10485760\|1073741824\|0\|a,m,p,s` Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	25

TCP SYN (p0f)

fingerprint	co-occurrences
`4:56+8:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	16
`4:50+14:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	8
`4:52+12:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_10`	25

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36`	16
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36 Edg/132.0.0.0`	8
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`IT` · Italy	9
`SE` · Sweden	8
`CZ` · Czechia	8

Network (ASN)

fingerprint	co-occurrences
`AS212238` · Datacamp Limited	16
`AS206092` · F.N.S. HOLDINGS LIMITED	9