TLS ClientHello (JA4)

t13d1712h2_5b57614c22b0_d5fe2c511efa

first seen 2026-06-14 01:58 · last seen 2026-09-15 01:33 · JSON

Last 7 days (14 observations)

Distinct clients per day (last 30 days, peak 5/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 count12
ALPNh2
Ciphers002f, 0035, 009c, 009d, 1301, 1302, 1303, c009, c00a, c013, c014, c02b, c02c, c02f, c030, cca8, cca9
Extensions000a, 000b, 000d, 0017, 0023, 0029, 002b, 002d, 0033, ff01
Signature algorithms0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601, 0201
JA4_rt13d1712h2_002f,0035,009c,009d,1301,1302,1303,c009,c00a,c013,c014,c02b,c02c,c02f,c030,cca8,cca9_000a,000b,000d,0017,0023,0029,002b,002d,0033,ff01_0403,0804,0401,0503,0805,0501,0806,0601,0201
JA4_o (sample)t13d1712h2_a1173ee55758_a9b354ff3918
JA4_ro (sample)t13d1712h2_1301,1302,1303,c02b,cca9,c02f,cca8,c009,c013,009c,002f,c02c,c030,c00a,c014,009d,0035_0000,0017,ff01,000a,000b,0023,0010,000d,0033,002d,002b,0029_0403,0804,0401,0503,0805,0501,0806,0601,0201

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
ge20nn06enus_32386ca2063f_000000000000_00000000000046
ge20nn060000_ae91ff777030_000000000000_00000000000024
ge20nn07enus_bba0b359f971_000000000000_00000000000010
ge20nn070000_f327ee591e3a_000000000000_0000000000007

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s87

TCP SYN (p0f)

fingerprintco-occurrences
4:43+21:0:1368:64860,9:mss,sok,ts,nop,ws:df,id+:010
4:44+20:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:08
4:49+15:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:08
4:48+16:0:1368:64860,9:mss,sok,ts,nop,ws:df,id+:08
4:48+16:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:06
4:39+25:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:05
4:47+17:0:1368:64860,9:mss,sok,ts,nop,ws:df,id+:05
4:38+26:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:05
4:42+22:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:04
4:47+17:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:04

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1418_944
64860_2-4-8-1-3_1368_924

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot56
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36; compatible; OAI-SearchBot/1.0; +https://openai.com/searchbot31

Country

fingerprintco-occurrences
US · United States46
JP · Japan7
DK · Denmark7
CH · Switzerland4
NZ · New Zealand4
DE · Germany3
BR · Brazil3
AU · Australia2
KR · South Korea2
BE · Belgium2

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation87