TLS ClientHello (JA4)

t13d1517h1_8daaf6152771_3cbfd9057e0d

first seen 2026-09-24 19:47 · last seen 2026-10-24 04:55 · 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	`15`
Extension count	`17`
ALPN	`h1`
Ciphers	`002f, 0035, 009c, 009d, 1301, 1302, 1303, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 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	`t13d1517h1_002f,0035,009c,009d,1301,1302,1303,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,001b,001c,0022,0023,002b,002d,0033,fe0d,ff01_0403,0503,0603,0804,0805,0806,0401,0501,0601,0203,0201`
JA4_o (sample)	`t13d1517h1_77608d807651_df135d36b6d5`
JA4_ro (sample)	`t13d1517h1_1301,1303,1302,c02b,c02f,cca9,cca8,c02c,c030,c013,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0023,0010,0005,0022,0012,0033,002b,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
`ge11nr12en00_17b2385f2ffa_000000000000_000000000000`	2
`ge11nn13en00_9c21dd9b577f_000000000000_000000000000`	1
`ge11nn13enus_774025d249a8_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`6:233+22:0:1432:62580,10:mss,sok,ts,nop,ws:flow:0`	2
`6:57+7:0:1360:65535,13:mss,sok,ts,nop,ws:flow:0`	1
`6:232+23:0:1432:62580,10:mss,sok,ts,nop,ws:flow:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`62580_2-4-8-1-3_1432_10`	3
`65535_2-4-8-1-3_1360_13`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64; rv:156.0) Gecko/20100101 Firefox/156.0`	3
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:158.0) Gecko/20100101 Firefox/158.0`	1

Country

fingerprint	co-occurrences
`ES` · Spain	3
`US` · United States	1

Network (ASN)

fingerprint	co-occurrences
`AS57269` · DIGI SPAIN TELECOM S.A	3
`AS13335` · Cloudflare, Inc.	1

TLS supported groups

fingerprint	co-occurrences
`11ec,001d,0017,0018,0019` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.	1