TLS ClientHello (JA4)

t13d1717h2_5b57614c22b0_68c5a8c2958d

first seen 2026-07-09 10:35 · last seen 2026-10-04 16:10 · 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 count17
Extension count17
ALPNh2
Ciphers002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9
Extensions0005, 000a, 000b, 000d, 0012, 0017, 001b, 001c, 0022, 0023, 002b, 002d, 0033, fe0d, ff01
Signature algorithms0403, 0503, 0603, 0804, 0805, 0806, 0401, 0501, 0601, 0201
JA4_rt13d1717h2_002f,0035,009c,009d,1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,001b,001c,0022,0023,002b,002d,0033,fe0d,ff01_0403,0503,0603,0804,0805,0806,0401,0501,0601,0201
JA4_o (sample)t13d1717h2_5b234860e130_02cb82eae503
JA4_ro (sample)t13d1717h2_1301,1303,1302,c02b,c02f,cca9,cca8,c02c,c030,c00a,c009,c013,c014,009c,009d,002f,0035_0000,0017,ff01,000a,000b,0023,0010,0005,0022,0012,0033,002b,000d,002d,001c,001b,fe0d_0403,0503,0603,0804,0805,0806,0401,0501,0601,0201

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)

fingerprintco-occurrences
ge20nr10dede_9fcbd3f1e2d6_000000000000_0000000000001
ge20nn13enus_1d953776a77e_000000000000_0000000000001
ge20nn10kokr_71a24014cdf5_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s3

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1380:mss*20,7:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1380:mss*20,7:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
27600_2-4-8-1-3_1380_72
64240_2-4-8-1-3_1460_71

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.01
Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.01

Country

fingerprintco-occurrences
CN · China2
US · United States1

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE1
AS200373 · 3xK Tech GmbH1
AS4837 · CHINA UNICOM China169 Backbone1