TLS ClientHello (JA4)

t13d1716h2_5b57614c22b0_eeeea6562960

first seen 2026-06-12 15:53 · last seen 2026-09-01 19:09 · JSON

Distinct clients per day (last 30 days, peak 5/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	`17`
Extension count	`16`
ALPN	`h2`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0017, 001b, 001c, 0022, 0023, 002b, 002d, 0033, fe0d, ff01`
Signature algorithms	`0403, 0503, 0603, 0804, 0805, 0806, 0401, 0501, 0601, 0203, 0201`
JA4_r	`t13d1716h2_002f,0035,009c,009d,1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0017,001b,001c,0022,0023,002b,002d,0033,fe0d,ff01_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`
JA4_o (sample)	`t13d1716h2_5b234860e130_89037267dcba`
JA4_ro (sample)	`t13d1716h2_1301,1303,1302,c02b,c02f,cca9,cca8,c02c,c030,c00a,c009,c013,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0023,0010,0005,0022,0033,002b,000d,002d,001c,001b,fe0d_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`

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
`ge20nn11enus_3901d4197baf_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	17

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`1:65536;2:0;4:131072;5:16384\|12517377\|1:0:0:256\|m,p,a,s`	15
`1:65536;2:0;4:131072;5:16384\|12517377\|1:0:0:42\|m,p,a,s`	2

TCP SYN (p0f)

fingerprint	co-occurrences
`6:47+17:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	2
`6:55+9:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0`	2
`4:50+14:0:1460:32768,10:mss,nop,ws,sok,ts::0`	2
`4:51+13:0:1460:32768,10:mss,nop,ws,sok,ts::0`	2
`4:54+10:0:1460:32768,10:mss,nop,ws,sok,ts::0`	2
`4:47+17:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:0`	1
`4:48+16:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1
`6:53+11:0:1440:65535,8:mss,nop,ws,nop,nop,sok:flow:0`	1
`4:55+9:0:1340:27520,7:mss,sok,ts,nop,ws::0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`32768_2-1-3-4-8_1460_10`	6
`64800_2-4-8-1-3_1440_7`	4
`64240_2-4-8-1-3_1460_7`	2
`27520_2-4-8-1-3_1340_7`	2
`64240_2-4-8-1-3_1460_10`	1
`65535_2-1-3-1-1-4_1440_8`	1
`62314_2-4-8-1-3_8902_12`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0`	12
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.3) Gecko/20100101 Firefox/137.3`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.9) Gecko/20100101 Firefox/135.9`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.9) Gecko/20100101 Firefox/137.9`	1
`Mozilla/5.0 (X11; Linux x86_64; rv:125.8) Gecko/20100101 Firefox/125.8`	1
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.3) Gecko/20100101 Firefox/137.3`	1

Country

fingerprint	co-occurrences
`NL` · Netherlands	7
`SE` · Sweden	3
`FI` · Finland	3
`US` · United States	2
`DE` · Germany	1
`BR` · Brazil	1

Network (ASN)

fingerprint	co-occurrences
`AS215125` · Church of Cyberology	6
`AS24940` · Hetzner Online GmbH	3
`AS212238` · Datacamp Limited	2
`AS214379` · South Park Networks LLC	2
`AS61125` · SABOTAGE LLC	1
`AS28573` · Claro NXT Telecomunicacoes Ltda	1
`AS214503` · QuxLabs AB	1
`AS205100` · F3 Netze e.V.	1