TLS ClientHello (JA4)

t12d280900_0df5e5c63df4_5c2ba2672724

first seen 2026-06-19 21:58 · last seen 2026-09-05 20:48 · 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 version12
SNId (domain)
Cipher count28
Extension count9
ALPN00
Ciphers0032, 0033, 0038, 0039, 0040, 0067, 006a, 006b, 009e, 009f, 00a2, 00a3, 00ff, c009, c00a, c013, c014, c023, c024, c027, c028, c02b, c02c, c02f, c030, cca8, cca9, ccaa
Extensions0005, 000a, 000b, 000d, 0011, 0017, 002b, 0032
Signature algorithms0403, 0503, 0603, 0804, 0805, 0806, 0809, 080a, 080b, 0401, 0501, 0601, 0402, 0303, 0301, 0302
JA4_rt12d280900_0032,0033,0038,0039,0040,0067,006a,006b,009e,009f,00a2,00a3,00ff,c009,c00a,c013,c014,c023,c024,c027,c028,c02b,c02c,c02f,c030,cca8,cca9,ccaa_0005,000a,000b,000d,0011,0017,002b,0032_0403,0503,0603,0804,0805,0806,0809,080a,080b,0401,0501,0601,0402,0303,0301,0302
JA4_o (sample)t12d280900_d99beed5f905_cdfd330d675e
JA4_ro (sample)t12d280900_c02c,c02b,cca9,c030,cca8,c02f,009f,ccaa,00a3,009e,00a2,c024,c028,c023,c027,006b,006a,0067,0040,c00a,c014,c009,c013,0039,0038,0033,0032,00ff_0000,0005,000a,000b,000d,0032,0011,0017,002b_0403,0503,0603,0804,0805,0806,0809,080a,080b,0401,0501,0601,0402,0303,0301,0302

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
ge10nr040000_532a1ee47909_000000000000_000000000000125
ge10nr040000_ef4d07580f66_000000000000_0000000000003
ge10nr030000_0db47b7d240d_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:56+8:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:091
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:015
4:56+8:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:07
4:48+16:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:05
4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:04
4:54+10:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:56+8:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:01
4:57+7:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_1291
64240_2-4-8-1-3_1460_729
65535_2-4-8-1-3_1460_104
29200_2-4-8-1-3_1460_101

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36129

Country

fingerprintco-occurrences
NL · Netherlands124
US · United States5

Network (ASN)

fingerprintco-occurrences
AS211486 · Alferov Aleksey Aleksandrovich37
AS205997 · Vlad Cojuhari28
AS213474 · HomeLine Broadband LLC25
AS213438 · ColocaTel Inc.19
AS213790 · Limited Network LTD14
AS62240 · Clouvider5
AS210328 · AO ALMAZ1