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JA4 t12d490600_730fb1b0ac6a_25552ceac63b

Unclassified — observed in live traffic

Unclassified

t12d490600_730fb1b0ac6a_25552ceac63b

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

What this fingerprint encodes

JA4_a t12d490600 handshake shape, human-readable
JA4_b 730fb1b0ac6a truncated hash of the cipher list
JA4_c 25552ceac63b truncated hash of extensions + signature algorithms
Transport
TCP
TLS version
TLS 1.2
Server name
server name sent
Cipher suites offered
49
Extensions offered
6
ALPN
none offered

Same tool, different options

These 44 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.

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 49

Extensions 6

Named groups 4

Point formats 3

Raw JA3 string
771,49200-49196-49199-49195-159-158-49202-49198-49201-49197-165-161-164-160-49192-49188-49172-49162-49194-49190-49167-49157-49191-49187-49171-49161-49193-49189-49166-49156-107-105-104-57-55-54-103-63-62-51-49-48-157-156-61-53-60-47-255,0-11-10-35-13-15,23-25-24-22,0-1-2

Seen in live traffic

Connections
14
First seen
2026-08-28 15:07 UTC
Last seen
2026-08-28 15:36 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.