TLS ClientHello (JA4)

t13d1814h1_5103eae14fdb_97a66a8f4cb1

first seen 2026-10-19 16:08 · last seen 2026-10-19 16:34 · 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 count18
Extension count14
ALPNh1
Ciphers0067, 006b, 009e, 009f, 1301, 1302, 1303, 1304, c023, c024, c027, c028, c02b, c02c, c02f, c030, cca8, cca9
Extensions000a, 000b, 000d, 0015, 0016, 0017, 001b, 002b, 002d, 0031, 0033, ff01
Signature algorithms0403, 0503, 0603, 0807, 0808, 0809, 080a, 080b, 0804, 0805, 0806, 0401, 0501, 0601, 0303, 0301
JA4_rt13d1814h1_0067,006b,009e,009f,1301,1302,1303,1304,c023,c024,c027,c028,c02b,c02c,c02f,c030,cca8,cca9_000a,000b,000d,0015,0016,0017,001b,002b,002d,0031,0033,ff01_0403,0503,0603,0807,0808,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301
JA4_o (sample)t13d1814h1_fd0104b61386_a69e9b51c437
JA4_ro (sample)t13d1814h1_1302,1303,1301,1304,c02c,c030,c02b,c02f,cca9,cca8,c024,c028,c023,c027,009f,009e,006b,0067_ff01,0000,000b,000a,0010,0016,0017,0031,000d,002b,002d,0033,001b,0015_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
ge11nn08enus_af99b8299ab8_000000000000_0000000000002

TCP SYN (p0f)

fingerprintco-occurrences
4:46+18:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1357:mss*44,7:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_71
64240_2-4-8-1-3_1357_71

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Mobile/15E148 Safari/604.12

Country

fingerprintco-occurrences
SG · Singapore2

Network (ASN)

fingerprintco-occurrences
AS55430 · Starhub Ltd1
AS4773 · MobileOne Ltd. Mobile/Internet Service Provider Singapore1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2