TLS ClientHello (JA4)

t13d091100_f91f431d341e_f50d94e863eb

first seen 2026-10-16 16:01 · last seen 2026-10-23 08:49 · JSON

Distinct clients per day (last 30 days, peak 3/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 count9
Extension count11
ALPN00
Ciphers1301, 1302, 1303, c02b, c02c, c02f, c030, cca8, cca9
Extensions0005, 000a, 000b, 000d, 0012, 0017, 002b, 0032, 0033, ff01
Signature algorithms0904, 0905, 0906, 0804, 0403, 0807, 0805, 0806, 0401, 0501, 0601, 0503, 0603
JA4_rt13d091100_1301,1302,1303,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0012,0017,002b,0032,0033,ff01_0904,0905,0906,0804,0403,0807,0805,0806,0401,0501,0601,0503,0603
JA4_o (sample)t13d091100_8e4c1465eaca_1c4e93964491
JA4_ro (sample)t13d091100_c02b,c02f,c02c,c030,cca9,cca8,1301,1302,1303_0000,000b,ff01,0017,0012,0005,000a,000d,0032,002b,0033_0904,0905,0906,0804,0403,0807,0805,0806,0401,0501,0601,0503,0603

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
ge11nr110000_4121cdd5775b_000000000000_0000000000002
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.25.0, wget 1.21.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn120000_79fdf4bb30c4_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:58+6:0:1420:mss*46,9:mss,sok,ts,nop,ws:df,id+,ecn:04

TCP SYN (JA4T)

fingerprintco-occurrences
65320_2-4-8-1-3_1420_94

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0 Safari/537.363
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)1

Country

fingerprintco-occurrences
US · United States4

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC4

TLS supported groups

fingerprintco-occurrences
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.4