JA4 q13d0115h3_0f2cb44170f4_fb190d169104

q13d0115h3_0f2cb44170f4_fb190d169104

Completed a TLS handshake but never an HTTP request, so no User-Agent was ever presented.

What this fingerprint encodes

Transport

QUIC

TLS version

TLS 1.3

Server name

server name sent

Cipher suites offered

1

Extensions offered

15

ALPN

h3

Same tool, different options

These 3 other fingerprints share this one's JA4_c — the extension and signature-algorithm hash. A client that keeps its extension set constant while varying its cipher list produces exactly this pattern, which is what a scanner iterating cipher suites looks like. A JA3 cannot show you this: its single MD5 collapses ciphers and extensions together, so every variation looks like an unrelated client.

• q13d0215h3_62ed6f6ca7ad_fb190d169104
• q13d0215h3_fffbd61365f3_fb190d169104
• q13d0315h3_55b375c5d22e_fb190d169104

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 1

• TLS_AES_128_GCM_SHA256

Extensions 15

• ec_point_formats
• psk_key_exchange_modes
• application_layer_protocol_negotiation
• signature_algorithms_cert
• extended_master_secret
• supported_groups
• quic_transport_parameters
• renegotiation_info
• status_request
• key_share
• signed_certificate_timestamp
• server_name
• signature_algorithms
• supported_versions
• session_ticket

Named groups 4

• secp521r1
• secp384r1
• secp256r1
• x25519

Point formats 1

• uncompressed

771,4865,11-45-16-50-23-10-57-65281-5-51-18-0-13-43-35,25-24-23-29,0

Seen in live traffic

Connections

1

First seen

2026-09-13 18:26 UTC

Last seen

2026-09-13 18:26 UTC

Transport

QUIC

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.