TLS ClientHello (JA4)

t13d1311h2_ef8c39609570_9ced094328c9

first seen 2026-08-18 07:16 · last seen 2026-10-10 19:02 · JSON

Distinct clients per day (last 30 days, peak 2/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

Protocolt (TLS over TCP)
TLS version13
SNId (domain)
Cipher count13
Extension count11
ALPNh2
Ciphers002f, 0035, 009c, 009d, 1301, 1302, 1303, c014, c02b, c02c, c030, cca8, cca9
Extensions000a, 000b, 000d, 0017, 0023, 002b, 002d, 0033, ff01
Signature algorithms0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601
JA4_rt13d1311h2_002f,0035,009c,009d,1301,1302,1303,c014,c02b,c02c,c030,cca8,cca9_000a,000b,000d,0017,0023,002b,002d,0033,ff01_0403,0804,0401,0503,0805,0501,0806,0601
JA4_o (sample)t13d1311h2_419b8ae4f619_2c197d909930
JA4_ro (sample)t13d1311h2_1301,1302,1303,c030,cca9,c014,009c,cca8,0035,c02b,002f,c02c,009d_002b,002d,0017,0000,0010,000a,ff01,0033,000b,000d,0023_0403,0804,0401,0503,0805,0501,0806,0601

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)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_000000000000_0000000000008

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p8

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1460:32768,10:mss,nop,ws,sok,ts::02
4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1460:mss*44,9:mss,nop,nop,sok,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_72
64240_2-4-8-1-3_1460_102
32768_2-1-3-4-8_1460_102
65535_2-4-8-1-3_1460_91
64240_2-1-1-4-1-3_1460_91

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.9 Safari/537.364
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.6 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.5 Safari/537.361

Country

fingerprintco-occurrences
DE · Germany3
NL · Netherlands2
US · United States1
AT · Austria1
DK · Denmark1

Network (ASN)

fingerprintco-occurrences
AS215125 · Church of Cyberology2
AS205100 · F3 Netze e.V.2
AS60729 · Stiftung Erneuerbare Freiheit1
AS27284 · Fourplex Telecom LLC1
AS208323 · Foundation for Applied Privacy1
AS57860 · Zencurity ApS1