TLS ClientHello (JA4)

t13d1312h2_f57a46bbacb6_e5728521abd4

first seen 2026-06-11 01:52 · last seen 2026-09-07 17:49 · 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	`13`
Extension count	`12`
ALPN	`h2`
Ciphers	`1301, 1302, 1303, c009, c00a, c013, c014, 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, 0201, 0203`
JA4_r	`t13d1312h2_1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,002b,0032,0033,ff01_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603,0201,0203`
JA4_o (sample)	`t13d1312h2_45672f90a73c_c9c082b8df90`
JA4_ro (sample)	`t13d1312h2_c02b,c02f,c02c,c030,cca9,cca8,c009,c013,c00a,c014,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0032,0010,002b,0033_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603,0201,0203`

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
`po20nn040000_a1c8fcd1f2bb_000000000000_000000000000`	109
`ge20nr030000_0db47b7d240d_000000000000_000000000000`	9
`ge20nr06enus_72b8a3968de3_000000000000_000000000000`	1
`ge20nn04enus_39a3ba4480e8_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog.	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 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.	120

TCP SYN (p0f)

fingerprint	co-occurrences
`4:118+10:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	109
`4:113+15:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	3
`4:112+16:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	3
`4:115+13:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	3
`4:120+8:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:49+15:0:1360:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-4_1460_8`	109
`64240_2-4-8-1-3_1360_7`	1

User-Agent

fingerprint	co-occurrences
`Go-http-client/2.0`	109
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36`	3
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36`	3
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36`	3
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36`	1
`Mozilla/5.0 (Linux; Android 13; SM-A037U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Mobile Safari/537.36`	1

Country

fingerprint	co-occurrences
`RO` · Romania	109
`NL` · Netherlands	9
`US` · United States	1
`GB` · United Kingdom	1

Network (ASN)

fingerprint	co-occurrences
`AS204428` · SS-Net	109
`AS197170` · TechTies Inc.	9
`AS16509` · Amazon.com, Inc.	1
`AS210619` · Monkey Tree Hosting Limited	1