TLS ClientHello (JA4)

t13d1310h2_19786d24d359_560390466015

first seen 2026-08-17 22:09 · last seen 2026-10-11 21:39 · 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

Protocolt (TLS over TCP)
TLS version13
SNId (domain)
Cipher count13
Extension count10
ALPNh2
Ciphers002f, 009c, 009d, 1301, 1302, 1303, c013, c014, c02b, c02f, c030, cca8, cca9
Extensions000a, 000b, 000d, 0017, 002b, 002d, 0033, ff01
Signature algorithms0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601
JA4_rt13d1310h2_002f,009c,009d,1301,1302,1303,c013,c014,c02b,c02f,c030,cca8,cca9_000a,000b,000d,0017,002b,002d,0033,ff01_0403,0804,0401,0503,0805,0501,0806,0601
JA4_o (sample)t13d1310h2_7299fcc2b077_3ef0df0cd77d
JA4_ro (sample)t13d1310h2_1301,1302,1303,cca9,c030,009c,c014,c02b,002f,cca8,009d,c013,c02f_000d,0033,0017,000b,002d,ff01,0000,0010,000a,002b_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_0000000000006

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p6

TCP SYN (p0f)

fingerprintco-occurrences
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
4:53+11:0:8902:mss*7,12:mss,sok,ts,nop,ws:df,id+,ecn:01
4:49+15:0:1460:32768,10:mss,nop,ws,sok,ts::01
4:54+10:0:1460:32768,10:mss,nop,ws,sok,ts::01
4:48+16:0:1460:mss*44,9:mss,nop,nop,sok,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
32768_2-1-3-4-8_1460_102
64240_2-4-8-1-3_1460_71
65535_2-4-8-1-3_1460_91
64240_2-1-1-4-1-3_1460_91
62314_2-4-8-1-3_8902_121

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.4 Safari/537.36 Edg/135.0.0.42
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.7 Safari/605.1.152
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.5 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.1 Safari/537.36 Edg/135.0.0.11

Country

fingerprintco-occurrences
NL · Netherlands2
DE · Germany1
US · United States1
SE · Sweden1
AT · Austria1

Network (ASN)

fingerprintco-occurrences
AS215125 · Church of Cyberology2
AS60729 · Stiftung Erneuerbare Freiheit1
AS27284 · Fourplex Telecom LLC1
AS214503 · QuxLabs AB1
AS208323 · Foundation for Applied Privacy1