TLS ClientHello (JA4)

q13d0311h3_55b375c5d22e_79b1d776df59

first seen 2026-08-23 09:13 · last seen 2026-08-23 09:13 · JSON

Inconsistencies

User-Agents observed with this fingerprint that contradict what it proves at the wire. all inconsistencies →

fingerprint User-Agent claims wire shows confidence seen first seen last seen

q13d0311h3_55b375c5d22e_79b1d776df59

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW…

User-Agent claims Chrome 151.0.0.0

TLS extensions or signature algorithms differ from every measured Chrome capture

The cipher suites match Chrome, but the extension set or signature algorithms differ from every capture even after normalizing handshake-variant extensions. Most likely a field-trial, ECH, or build variant the catalog has not captured; occasionally mimicry. This sharpens as catalog coverage grows.

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36
Claimed version	151.0.0.0
Measured versions	151.0.7922.174, 149.0.7827.103, 149.0.7827.53, 149.0.7827.115, 149.0.7827.114, 153.0.8010.47, 149.0.7827.54, 149.0.7827.201, 150.0.7871.187, 153.0.8010.36, 151.0.7922.170, 152.0.7977.83, 152.0.7977.82, 152.0.7977.65, 150.0.7871.114, 150.0.7871.115, 150.0.7871.129, 151.0.7922.72, 151.0.7922.137, 152.0.7977.75, 151.0.7922.173, 149.0.7827.102, 149.0.7827.156, 151.0.7922.71, 150.0.7871.128, 151.0.7922.108, 149.0.7827.155, 150.0.7871.125, 150.0.7871.46, 151.0.7922.109, 152.0.7977.64, 148.0.7778.179, 149.0.7827.200
Layer	cipher suites match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-08-23

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	`q (QUIC)`
TLS version	`13`
SNI	`d (domain)`
Cipher count	`3`
Extension count	`11`
ALPN	`h3`
Ciphers	`1301, 1302, 1303`
Extensions	`000a, 000d, 001b, 002b, 002d, 0033, 0039, 44cd, fe0d`
Signature algorithms	`0904, 0905, 0906, 0403, 0804, 0401, 0503, 0805, 0501, 0806, 0601`
JA4_r	`q13d0311h3_1301,1302,1303_000a,000d,001b,002b,002d,0033,0039,44cd,fe0d_0904,0905,0906,0403,0804,0401,0503,0805,0501,0806,0601`
JA4_o (sample)	`q13d0311h3_55b375c5d22e_eb2c726df2c7`
JA4_ro (sample)	`q13d0311h3_1301,1302,1303_0000,000a,000d,0010,001b,002b,002d,0033,0039,44cd,fe0d_0904,0905,0906,0403,0804,0401,0503,0805,0501,0806,0601`

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
`ge30nn13enus_0c2c1d640f3e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, edge 151.0.4129.93, chrome 151.0.7922.109, +24 more.The fingerprint page shows the full measured match list. More on the catalog.	1

QUIC transport params

fingerprint	co-occurrences
`q12_97eeb91f9c98` Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +41 more.The fingerprint page shows the full measured match list. More on the catalog.	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`GB` · United Kingdom	1

Network (ASN)

fingerprint	co-occurrences
`AS5089` · Virgin Media Limited	1