TLS ClientHello (JA4)

t13d131300_f57a46bbacb6_fb48f8b98a29

first seen 2026-06-26 14:54 · last seen 2026-09-07 14:02 · 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	`13`
ALPN	`00`
Ciphers	`1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9`
Extensions	`0005, 000a, 000b, 000d, 0012, 0017, 0023, 002b, 002d, 0032, 0033, ff01`
Signature algorithms	`0804, 0403, 0807, 0805, 0806, 0401, 0501, 0601, 0503, 0603`
JA4_r	`t13d131300_1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,0023,002b,002d,0032,0033,ff01_0804,0403,0807,0805,0806,0401,0501,0601,0503,0603`
JA4_o (sample)	`t13d131300_45672f90a73c_e9ed89848ea7`
JA4_ro (sample)	`t13d131300_c02b,c02f,c02c,c030,cca9,cca8,c009,c013,c00a,c014,1301,1302,1303_0000,000b,0023,ff01,0017,0012,0005,000a,000d,0032,002b,0033,002d_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
`ge11nr04engb_8ddaef5d77af_000000000000_000000000000`	30
`ge11nr180000_96e223db5b4c_000000000000_000000000000`	13
`ge11nr020000_f24fcf356134_000000000000_000000000000`	3
`ge11nn05enus_1837273ddbac_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:113+15:0:1460:8192,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	28
`4:119+9:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	6
`6:110+18:0:1440:mss*45,8:mss,nop,ws,nop,nop,sok:ecn,flow:0`	6
`4:57+7:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	3
`4:112+16:0:1460:8192,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	1
`4:111+17:0:1460:8192,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0`	1
`4:112+16:0:1380:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	1
`4:43+21:0:1460:mss*29,11:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`8192_2-1-3-1-1-4_1460_8`	30
`64240_2-1-3-1-1-4_1460_8`	6
`64800_2-1-3-1-1-4_1440_8`	6
`65535_2-1-3-1-1-4_1380_8`	1
`42340_2-4-8-1-3_1460_11`	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.15`	30
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 Chrome/123.0.0.0 Safari/537.36`	3
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`	2
`Go-http-client/1.1`	2
`curl/8.5.0`	2
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 Chrome/122.0.0.0 Safari/537.36`	2
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/124.0.0.0 Safari/537.36`	2
`SofyaBot/1.0 (+https://sofya.co/bot)`	1

Country

fingerprint	co-occurrences
`NL` · Netherlands	40
`IT` · Italy	6
`AT` · Austria	1

Network (ASN)

fingerprint	co-occurrences
`AS213438` · ColocaTel Inc.	30
`AS197170` · TechTies Inc.	6
`AS212271` · Cinzia Tocci trading as Lumanex Srl	6
`AS206264` · Amarutu Technology Ltd	3
`AS14061` · DigitalOcean, LLC	1
`AS197540` · netcup GmbH	1