TLS ClientHello (JA4)

t12d380500_10ed599f3404_67a080e8974e

first seen 2026-07-01 20:35 · last seen 2026-09-06 06:56 · 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 version12
SNId (domain)
Cipher count38
Extension count5
ALPN00
Ciphers002f, 0033, 0035, 0039, 003c, 003d, 0041, 0045, 0067, 006b, 0081, 0084, 0088, 009c, 009d, 009e, 009f, 00ba, 00be, 00c0, 00c4, 00ff, c009, c00a, c013, c014, c023, c024, c027, c028, c02b, c02c, c02f, c030, cca8, cca9, ccaa, ff85
Extensions000a, 000b, 000d, 0023
Signature algorithms0601, 0603, efef, 0501, 0503, 0401, 0403, eeee, eded, 0301, 0303, 0201, 0203
JA4_rt12d380500_002f,0033,0035,0039,003c,003d,0041,0045,0067,006b,0081,0084,0088,009c,009d,009e,009f,00ba,00be,00c0,00c4,00ff,c009,c00a,c013,c014,c023,c024,c027,c028,c02b,c02c,c02f,c030,cca8,cca9,ccaa,ff85_000a,000b,000d,0023_0601,0603,efef,0501,0503,0401,0403,eeee,eded,0301,0303,0201,0203
JA4_o (sample)t12d380500_3e00221c0a60_9c45b007b922
JA4_ro (sample)t12d380500_cca9,cca8,ccaa,c030,c02c,c028,c024,c014,c00a,009f,006b,0039,ff85,00c4,0088,0081,009d,003d,0035,00c0,0084,c02f,c02b,c027,c023,c013,c009,009e,0067,0033,00be,0045,009c,003c,002f,00ba,0041,00ff_0000,000b,000a,0023,000d_0601,0603,efef,0501,0503,0401,0403,eeee,eded,0301,0303,0201,0203

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_5b1e8b5f4d2d_000000000000_0000000000003
ge11nn06enus_a89d28968959_000000000000_0000000000003
ge11nn050000_ea6f06182064_000000000000_0000000000002
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.21.3, wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:34+30:0:1200:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:03
4:50+14:0:1360:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:id-:02
4:49+15:0:1452:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
4:47+17:0:1452:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
4:51+13:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01
4:52+12:0:1460:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,id+,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-8-4-0-0_1200_63
65535_2-1-3-1-1-8-4-0-0_1460_62
65535_2-1-3-1-1-8-4-0-0_1452_62
65535_2-1-3-1-1-8-4-0-0_1360_62

User-Agent

fingerprintco-occurrences
Mozilla/5.02
Mozilla/5.0 (ClearHero target finder)2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.152
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.361
curl/8.01

Country

fingerprintco-occurrences
US · United States3
AM · Armenia3
ES · Spain2
EE · Estonia1

Network (ASN)

fingerprintco-occurrences
AS174 · Cogent Communications, LLC3
AS3352 · TELEFONICA DE ESPANA S.A.U.2
AS12297 · Telecom Armenia AS2
AS50635 · Skynet Telecom LLC1
AS51504 · AS Telset1