TLS ClientHello (JA4)

t12d330600_5172cef6ed69_021165082e1c

first seen 2026-06-15 14:44 · last seen 2026-09-16 13:08 · JSON

Last 7 days (48 observations)

Distinct clients per day (last 30 days, peak 16/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 version12
SNId (domain)
Cipher count33
Extension count6
ALPN00
Ciphers0004, 0005, 0005, 000a, 000a, 002f, 002f, 0035, 0035, 003c, 003d, 009c, c007, c007, c008, c009, c009, c00a, c00a, c011, c011, c012, c012, c013, c013, c014, c014, c023, c024, c027, c028, c02b, c02f
Extensions0005, 000a, 000b, 000d, ff01
Signature algorithms0401, 0403, 0201, 0203
JA4_rt12d330600_0004,0005,0005,000a,000a,002f,002f,0035,0035,003c,003d,009c,c007,c007,c008,c009,c009,c00a,c00a,c011,c011,c012,c012,c013,c013,c014,c014,c023,c024,c027,c028,c02b,c02f_0005,000a,000b,000d,ff01_0401,0403,0201,0203
JA4_o (sample)t12d330600_ce09824a445d_334f0aaed909
JA4_ro (sample)t12d330600_c011,c007,c013,c009,c014,c00a,0005,002f,0035,c012,000a,c024,c023,c00a,c009,c008,c028,c027,c014,c013,c012,003d,003c,0035,002f,000a,c007,c011,0005,0004,c02b,c02f,009c_0000,0005,000a,000b,000d,ff01_0401,0403,0201,0203

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)

fingerprintco-occurrences
ge11nr040000_e1d2031bdfea_000000000000_000000000000257
ge11nr040000_88d30a62b7ad_000000000000_00000000000026

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:091
4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:074
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:057
4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:020
4:54+10:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:012
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:011
4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:04
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:04
4:51+13:0:1460:mss*22,7:mss,sok,ts,nop,ws:df,id+:04
4:50+14:0:1460:mss*22,7:mss,sok,ts,nop,ws:df,id+:04

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7256

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.6312.86 Safari/537.36283

Country

fingerprintco-occurrences
US · United States181
NL · Netherlands102

Network (ASN)

fingerprintco-occurrences
AS211680 · NSEC - Sistemas Informaticos, S.A.202
AS21859 · Zenlayer Inc81