TLS ClientHello (JA4)

t13d1212h2_a538d02d76d5_f6eeaf393d2e

first seen 2026-09-13 07:59 · last seen 2026-10-10 05:02 · JSON

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

Protocol	`t (TLS over TCP)`
TLS version	`13`
SNI	`d (domain)`
Cipher count	`12`
Extension count	`12`
ALPN	`h2`
Ciphers	`00ff, 1301, 1302, 1303, c023, c024, c027, c028, c02b, c02c, c02f, c030`
Extensions	`0005, 000a, 000b, 000d, 0016, 0017, 0023, 002b, 002d, 0033`
Signature algorithms	`0403, 0503, 0603, 0807, 0808, 0809, 080a, 080b, 0804, 0805, 0806, 0401, 0501, 0601, 0303, 0301, 0302, 0402, 0502, 0602`
JA4_r	`t13d1212h2_00ff,1301,1302,1303,c023,c024,c027,c028,c02b,c02c,c02f,c030_0005,000a,000b,000d,0016,0017,0023,002b,002d,0033_0403,0503,0603,0807,0808,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301,0302,0402,0502,0602`
JA4_o (sample)	`t13d1212h2_3c962d0d4049_63c54f8ac228`
JA4_ro (sample)	`t13d1212h2_1302,1303,1301,c02c,c02b,c030,c02f,c024,c023,c028,c027,00ff_0000,000b,000a,0023,0005,0010,0016,0017,000d,002b,002d,0033_0403,0503,0603,0807,0808,0809,080a,080b,0804,0805,0806,0401,0501,0601,0303,0301,0302,0402,0502,0602`

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)

fingerprint	co-occurrences
`ge20nn04enus_39a3ba4480e8_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: urlsession 6.1.2.The fingerprint page shows the full measured match list. More on the catalog.	9
`ge20nn020000_fb4f949fd323_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.	4

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`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 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.	13

TCP SYN (p0f)

fingerprint	co-occurrences
`4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	9
`4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	2
`4:53+11:0:1460:62727,10:mss,sok,ts,nop,ws:df,id+:0`	2

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_7`	11
`62727_2-4-8-1-3_1460_10`	2

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36`	9
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36`	4

Country

fingerprint	co-occurrences
`NL` · Netherlands	7
`PL` · Poland	4
`US` · United States	2

Network (ASN)

fingerprint	co-occurrences
`AS218785` · TC DATACENTER LIMITED	11
`AS14618` · Amazon.com, Inc.	2