JA4 t12d420600_a4993b992045_ead284e5d3ae

t12d420600_a4993b992045_ead284e5d3ae

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

42

Extensions offered

6

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.

• t12d100600_75366a718a82_ead284e5d3ae

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 42

• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
• TLS_RSA_WITH_AES_256_CBC_SHA256
• 49190 (0xc026)
• 49194 (0xc02a)
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
• 106 (0x006a)
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
• TLS_RSA_WITH_AES_256_CBC_SHA
• 49157 (0xc005)
• 49167 (0xc00f)
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA
• 56 (0x0038)
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
• TLS_RSA_WITH_AES_128_CBC_SHA256
• 49189 (0xc025)
• 49193 (0xc029)
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
• 64 (0x0040)
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
• TLS_RSA_WITH_AES_128_CBC_SHA
• 49156 (0xc004)
• 49166 (0xc00e)
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA
• 50 (0x0032)
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
• TLS_RSA_WITH_AES_256_GCM_SHA384
• 49198 (0xc02e)
• 49202 (0xc032)
• TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
• 163 (0x00a3)
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• TLS_RSA_WITH_AES_128_GCM_SHA256
• 49197 (0xc02d)
• 49201 (0xc031)
• TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
• 162 (0x00a2)

Extensions 6

• supported_groups
• ec_point_formats
• signature_algorithms
• extended_master_secret
• server_name
• renegotiation_info

Named groups 10

• secp256r1
• secp384r1
• secp521r1
• 9 (0x0009)
• 10 (0x000a)
• 11 (0x000b)
• 12 (0x000c)
• 13 (0x000d)
• 14 (0x000e)
• 22 (0x0016)

Point formats 1

• uncompressed

771,49188-49192-61-49190-49194-107-106-49162-49172-53-49157-49167-57-56-49187-49191-60-49189-49193-103-64-49161-49171-47-49156-49166-51-50-49196-49195-49200-157-49198-49202-159-163-49199-156-49197-49201-158-162,10-11-13-23-0-65281,23-24-25-9-10-11-12-13-14-22,0

Seen in live traffic

Connections

27

First seen

2026-10-19 20:41 UTC

Last seen

2026-10-20 06:32 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.