TLS ClientHello (JA4)

q13d0315h3_55b375c5d22e_bb76f32061e3

first seen 2026-06-11 00:36 · last seen 2026-09-02 08:32 · 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

q13d0315h3_55b375c5d22e_bb76f32061e3

Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/…

User-Agent claims Firefox 151.0

TLS extensions or signature algorithms differ from every measured Firefox capture

The cipher suites match Firefox, 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 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0
Claimed version	151.0
Measured versions	146.0.1, 152.0.1, 154.0, 140.0.2, 151.0.4, 151.0.2, 139.0, 153.0.1, 155.0, 152.0.5, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 132.0, 152.0.3, 148.0.2, 137.0, 141.0, 155.0.1, 153.0, 151.0.3, 144.0.2, 154.0.1, 134.0, 152.0.4, 151.0
Layer	cipher suites match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-11

2026-06-26

q13d0315h3_55b375c5d22e_bb76f32061e3

Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/…

User-Agent claims Firefox 152.0

TLS extensions or signature algorithms differ from every measured Firefox capture

Full User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0
Claimed version	152.0
Measured versions	146.0.1, 152.0.1, 154.0, 140.0.2, 151.0.4, 151.0.2, 139.0, 153.0.1, 155.0, 152.0.5, 153.0.3, 142.0.1, 153.0.4, 152.0.6, 150.0.2, 135.0, 132.0, 152.0.3, 148.0.2, 137.0, 141.0, 155.0.1, 153.0, 151.0.3, 144.0.2, 154.0.1, 134.0, 152.0.4, 151.0
Layer	cipher suites match; extension set or signature algorithms differ
JA4 label	unlabeled

low

2026-06-29

2026-07-15

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	`15`
ALPN	`h3`
Ciphers	`1301, 1302, 1303`
Extensions	`0005, 000a, 000d, 0017, 001b, 001c, 0022, 002b, 002d, 0033, 0039, fe0d, ff01`
Signature algorithms	`0403, 0503, 0603, 0203, 0804, 0805, 0806, 0904, 0905, 0906, 0401, 0501, 0601, 0201`
JA4_r	`q13d0315h3_1301,1302,1303_0005,000a,000d,0017,001b,001c,0022,002b,002d,0033,0039,fe0d,ff01_0403,0503,0603,0203,0804,0805,0806,0904,0905,0906,0401,0501,0601,0201`
JA4_o (sample)	`q13d0315h3_85902d7a8465_73981ba6154b`
JA4_ro (sample)	`q13d0315h3_1301,1303,1302_001c,002b,0017,001b,0033,000a,002d,ff01,0000,0022,0005,0010,000d,0039,fe0d_0403,0503,0603,0203,0804,0805,0806,0904,0905,0906,0401,0501,0601,0201`

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
`ge30nr11enus_1d663b220259_000000000000_000000000000`	9
`ge30nr10enus_d6360b5be5ba_000000000000_000000000000`	7
`ge30nr12enus_aedbdef9ac1f_000000000000_000000000000`	6
`ge30nr11enus_7eaa533deebc_000000000000_000000000000`	6
`ge30nn11enus_7eaa533deebc_000000000000_000000000000`	5
`ge30nn12enus_aedbdef9ac1f_000000000000_000000000000`	4
`ge30nn10enus_9fcbd3f1e2d6_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.6, +18 more.The fingerprint page shows the full measured match list. More on the catalog.	2
`ge30nn11enus_8df96ab0b105_000000000000_000000000000`	1
`ge30nn11enus_ee114a2ec6cb_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 132.0.The fingerprint page shows the full measured match list. More on the catalog.	1
`ge30nr10enus_0d4f1bde28df_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 132.0, firefox 151.0.3, firefox 151.0.2, +1 more.The fingerprint page shows the full measured match list. More on the catalog.	1

QUIC transport params

fingerprint	co-occurrences
`q12_022106b74856` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	33
`q13_29150affcbde` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 151.0.3, firefox 132.0, firefox 151.0.4, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	17
`q13_c3e7031b10dc` Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 155.0.The fingerprint page shows the full measured match list. More on the catalog.	1

User-Agent

fingerprint	co-occurrences
`Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0`	27
`Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0`	23
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:156.0) Gecko/20100101 Firefox/156.0`	1

Country

fingerprint	co-occurrences
`AU` · Australia	50
`DE` · Germany	1

Network (ASN)

fingerprint	co-occurrences
`AS38195` · Superloop	50
`AS3320` · Deutsche Telekom AG	1

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprint	linked observations
`t13d1614h2_86a278354501_53a6d0ab1c42`	15
`t13d1615h2_86a278354501_a54fffd0eb61`	3
`t13d1616h2_86a278354501_0c27189014cf`	2