JA4 t12d191100_b83c0aa35c7d_702512ee992c

t12d191100_b83c0aa35c7d_702512ee992c

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

What this fingerprint encodes

Transport

TCP

TLS version

TLS 1.2

Server name

server name sent

Cipher suites offered

19

Extensions offered

11

ALPN

none offered

Same tool, different options

These 1 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.

• t12d441100_0450768a56c5_702512ee992c

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 19

• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
• 49198 (0xc02e)
• 49197 (0xc02d)
• 49190 (0xc026)
• 49189 (0xc025)
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
• 49157 (0xc005)
• 49156 (0xc004)
• TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
• 49155 (0xc003)
• TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
• 49154 (0xc002)
• 49158 (0xc006)
• 49153 (0xc001)

Extensions 11

• server_name
• status_request
• supported_groups
• ec_point_formats
• status_request_v2
• extended_master_secret
• session_ticket
• signature_algorithms
• supported_versions
• signature_algorithms_cert
• renegotiation_info

Named groups 5

• x25519
• secp256r1
• secp384r1
• secp521r1
• x448

Point formats 1

• uncompressed

771,49196-49195-52393-49188-49187-49198-49197-49190-49189-49162-49161-49157-49156-49160-49155-49159-49154-49158-49153,0-5-10-11-17-23-35-13-43-50-65281,29-23-24-25-30,0

Seen in live traffic

Connections

4

First seen

2026-10-21 01:14 UTC

Last seen

2026-10-21 01:14 UTC

Transport

TCP

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.