TLS ClientHello (JA4)

t13d1011h2_61a7ad8aa9b6_3a8073edd8ef

first seen 2026-06-12 21:13 · last seen 2026-09-14 17:59 · JSON

Last 7 days (2 observations)

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 count10
Extension count11
ALPNh2
Ciphers00ff, 1301, 1302, 1303, c02b, c02c, c02f, c030, cca8, cca9
Extensions0005, 000a, 000b, 000d, 0017, 0023, 002b, 002d, 0033
Signature algorithms0201, 0203, 0401, 0403, 0501, 0503, 0601, 0603, 0804, 0805, 0806, 0807, 0808
JA4_rt13d1011h2_00ff,1301,1302,1303,c02b,c02c,c02f,c030,cca8,cca9_0005,000a,000b,000d,0017,0023,002b,002d,0033_0201,0203,0401,0403,0501,0503,0601,0603,0804,0805,0806,0807,0808
JA4_o (sample)t13d1011h2_b9b30c653583_f3323997341c
JA4_ro (sample)t13d1011h2_1302,1301,1303,c02c,c02b,cca9,c030,c02f,cca8,00ff_0000,0033,0010,0023,000d,0005,0017,000b,002b,000a,002d_0201,0203,0401,0403,0501,0503,0601,0603,0804,0805,0806,0807,0808

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
ge20nn040000_be74ea4f9dce_000000000000_0000000000002
ge20nr020000_e5a56608905c_000000000000_0000000000002
ge20nr020000_baf4da5efb26_000000000000_0000000000002
ge20nr030000_b13238580f03_000000000000_0000000000001
ge20nr030000_80b089f68b8e_000000000000_0000000000001
ge20nr020000_5594a17e7e7e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog.7
2:0;4:65535;5:16384;6:16384|00|0|m,s,a,p2

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1436:65535,9:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:45+19:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:41+23:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1440:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:114+14:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1440_72
65535_2-4-8-1-3_1436_92
64240_2-4-8-1-3_1460_71
65535_2-1-3-1-1-4_1440_81

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.362
greedyhand/0.12
fingerprint-scan/0.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States8
NL · Netherlands1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation3
AS16276 · OVH SAS2
AS202412 · Omegatech LTD2
AS41608 · NextGenWebs, S.L.1
AS396356 · Latitude.sh1