TLS ClientHello (JA4)

t13d271200_c42a7efa14d1_a141b6f9fa1c

first seen 2026-09-19 11:57 · last seen 2026-10-22 21:49 · 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 count27
Extension count12
ALPN00
Ciphers0033, 0039, 0067, 006b, 009e, 009f, 1301, 1302, 1303, 1304, c009, c00a, c013, c014, c023, c027, c02b, c02c, c02f, c030, c09e, c09f, c0ac, c0ad, cca8, cca9, ccaa
Extensions000a, 000b, 000d, 0016, 0017, 001b, 0023, 002b, 002d, 0033, ff01
Signature algorithms0904, 0905, 0906, 0403, 0503, 0603, 0807, 0808, 0809, 080a, 080b, 0804, 0805, 0806, 0401, 0501, 0601, 0303, 0301
JA4_rt13d271200_0033,0039,0067,006b,009e,009f,1301,1302,1303,1304,c009,c00a,c013,c014,c023,c027,c02b,c02c,c02f,c030,c09e,c09f,c0ac,c0ad,cca8,cca9,ccaa_000a,000b,000d,0016,0017,001b,0023,002b,002d,0033,ff01_0904,0905,0906,0403,0503,0603,0807,0808,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301
JA4_o (sample)t13d271200_a30c4e511604_fc8919f735b9
JA4_ro (sample)t13d271200_1302,1303,1301,1304,c02c,c030,cca9,cca8,c0ad,c02b,c02f,c0ac,c023,c027,c00a,c014,c009,c013,009f,ccaa,c09f,009e,c09e,006b,0067,0039,0033_ff01,0000,000b,000a,0023,0016,0017,000d,002b,002d,0033,001b_0904,0905,0906,0403,0503,0603,0807,0808,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301

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
ge11nn040000_e1d2031bdfea_000000000000_0000000000003
po11nn060000_26b3802e1dc5_000000000000_0000000000003
ge11nn060000_f3b4d7f72ec1_000000000000_0000000000003

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:115+13:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:03
4:53+11:0:1460:mss*44,12:mss,sok,ts,nop,ws:df,id+:03

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_73
42340_2-1-1-4-1-3_1460_133
64240_2-4-8-1-3_1460_123

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.363

Country

fingerprintco-occurrences
DE · Germany3
US · United States3
FR · France3

Network (ASN)

fingerprintco-occurrences
AS200373 · 3xK Tech GmbH6
AS46475 · Limestone Networks, Inc.3

TLS supported groups

fingerprintco-occurrences
11ec,11eb,11ed,001d,0017,001e,0019,0018,0100,0101,0102,0103,01043