TLS ClientHello (JA4)

t13d1013h2_01be160bb49b_e24568c0d440

first seen 2026-08-05 18:52 · last seen 2026-10-19 17:32 · JSON

Distinct clients per day (last 30 days, peak 4/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 count13
ALPNh2
Ciphers1301, 1302, c023, c024, c027, c028, c02b, c02c, c02f, c030
Extensions0005, 000a, 000b, 000d, 0017, 0023, 002b, 002d, 0031, 0033, ff01
Signature algorithms0804, 0805, 0806, 0401, 0501, 0201, 0403, 0503, 0203, 0202, 0601, 0603
JA4_rt13d1013h2_1301,1302,c023,c024,c027,c028,c02b,c02c,c02f,c030_0005,000a,000b,000d,0017,0023,002b,002d,0031,0033,ff01_0804,0805,0806,0401,0501,0201,0403,0503,0203,0202,0601,0603
JA4_o (sample)t13d1013h2_8d8759d5f363_53aa1bee5020
JA4_ro (sample)t13d1013h2_1302,1301,c02c,c02b,c030,c02f,c024,c023,c028,c027_0000,0005,002b,000d,0023,000a,000b,0010,0033,0031,0017,ff01,002d_0804,0805,0806,0401,0501,0201,0403,0503,0203,0202,0601,0603

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
ge20nn060000_0c07ec02b430_000000000000_0000000000007
ge20nn010000_a510e5066512_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31, winhttp 10.0.20348.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.5
ge20nn000000_000000000000_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.12.0, rust-hyper 1.11.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nn020000_9b3c08a48073_000000000000_0000000000002
ge20nn070000_b9b17faf9a7f_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:10485760|10420225|0|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: winhttp 10.0.20348.1.The fingerprint page shows the full measured match list. More on the catalog.13
2:0;4:65535|67043329|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.4
2:0;4:10485760|33488897|0|m,p,a,s2

TCP SYN (p0f)

fingerprintco-occurrences
4:112+16:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:04
4:110+18:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:03
4:110+18:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:03
4:111+17:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:02
4:109+19:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:114+14:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:109+19:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01
4:113+15:0:1440:mss*44,0:mss,nop,nop,sok:df,id+,ecn:01
4:113+15:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-1-4_1440_007
64240_2-1-3-1-1-4_1440_86
65535_2-1-3-1-1-4_1440_86

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.367
schannel-defaults-experiment7
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States19

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation19

TLS supported groups

fingerprintco-occurrences
0018,0017 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.7, powershell 5.1.26100.33648, curl 8.21.0.The fingerprint page shows the full measured match list. More on the catalog.7