JA4 q13d0315h3_55b375c5d22e_2473069875c4

q13d0315h3_55b375c5d22e_2473069875c4

Firefox — inferred from the User-Agent on its requests.

What this fingerprint encodes

Transport

QUIC

TLS version

TLS 1.3

Server name

server name sent

Cipher suites offered

3

Extensions offered

15

ALPN

h3

The hello it was computed from

Recovered because the proxy now stores the pre-hash JA3 string alongside the digest. Every number below came out of this client's ClientHello; anything we cannot name in the IANA registry is shown as its raw value rather than guessed at.

Version

TLS 1.2

Cipher suites 3

• TLS_AES_128_GCM_SHA256
• TLS_CHACHA20_POLY1305_SHA256
• TLS_AES_256_GCM_SHA384

Extensions 15

• key_share
• application_layer_protocol_negotiation
• supported_versions
• 34 (0x0022)
• status_request
• compress_certificate
• psk_key_exchange_modes
• record_size_limit
• signature_algorithms
• supported_groups
• extended_master_secret
• renegotiation_info
• server_name
• quic_transport_parameters
• encrypted_client_hello

Named groups 5

• SecP256r1MLKEM768
• x25519
• secp256r1
• secp384r1
• secp521r1

771,4865-4867-4866,51-16-43-34-5-27-45-28-13-10-23-65281-0-57-65037,4588-29-23-24-25,

Seen in live traffic

Connections

271

First seen

2026-09-03 13:23 UTC

Last seen

2026-10-09 15:17 UTC

Transport

QUIC

JA3 hashes absorbed

271

The same client, 271 different JA3s

This one JA4 covers 271 distinct JA3 hashes. A JA3 hashes the cipher and extension lists in the order they arrived, so a client that shuffles them — which Chrome and its derivatives do on purpose — produces a new JA3 almost every connection and fragments into what looks like 271 unrelated clients. JA4 sorts those lists before hashing, which is why all of it lands here instead.

• e3ba17bb8fd1349735497bd9cac7d794
• 5b52711e7134114ca504ff5488d3b283
• 5bcb49a04b6d2a20b1adf5537301bdfc
• be692ef4d8eb1809079f8ffcb4fe1357
• 4116fa881abec9e8e77cbbba19990d43
• cbdc5554fa231b1409c5337dfdfbf819
• da780e729eb1d90a3ad1128545b748b6
• 19fdfb2dfb378f6ac3c8be679264c397
• 09b72fb2731d371019439a4b56b3a6e9
• be57692d27b685e51f4f21560fc7fc16
• f02acbb6fa43ba4cf706662112940e34
• 4e4fa64626c159b05572cb3a7e4f5510
• … and 259 more

User-Agents seen on this fingerprint

• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.0 1170×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:155.0) Gecko/20100101 Firefox/155.0 653×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0 495×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:157.0) Gecko/20100101 Firefox/157.0 379×
• Mozilla/5.0 (X11; Linux x86_64; rv:154.0) Gecko/20100101 Firefox/154.0 240×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:154.0) Gecko/20100101 Firefox/154.0 161×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:153.0) Gecko/20100101 Firefox/153.0 136×
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:155.0) Gecko/20100101 Firefox/155.0 123×
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:154.0) Gecko/20100101 Firefox/154.0 109×
• Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:155.0) Gecko/20100101 Firefox/155.0 80×
• Mozilla/5.0 (Android 16; Mobile; rv:157.0) Gecko/157.0 Firefox/157.0 65×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0 45×
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:154.0) Gecko/20100101 Firefox/154.0 19×
• Mozilla/5.0 (Android 17; Mobile; rv:155.0) Gecko/155.0 Firefox/155.0 19×
• Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0 14×
• Mozilla/5.0 (Android 14; Mobile; rv:154.0) Gecko/154.0 Firefox/154.0 7×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0 5×
• Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36 5×
• Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.0 4×
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:157.0) Gecko/20100101 Firefox/157.0 3×
• Mozilla/5.0 (X11; Linux x86_64; rv:157.0) Gecko/20100101 Firefox/157.0 2×
• Mozilla/5.0 (Android 15; Mobile; rv:154.0) Gecko/154.0 Firefox/154.0 2×
• Mozilla/5.0 (Android 16; Mobile; rv:155.0) Gecko/155.0 Firefox/155.0 1×

A User-Agent is self-declared and trivially forged, so this names an observation rather than proving an identity. It is still the strongest signal available: the fingerprint comes off the TLS handshake and the User-Agent off the request that followed, and one client build keeping a stable JA4 while changing what it calls itself is a finding in its own right.

This entry is an observation, not a policy decision. It is here because the edge saw it, not because anyone reviewed it, and it blocks nothing on its own. Only the curated tier drives classification and banning.