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JA4 t00d990100_523035705075_000000000000

Scanner — observed in live traffic

Scanner

t00d990100_523035705075_000000000000

Shares its JA4_c (000000000000) with 5 fingerprints classified as scanner, and nothing else in that family disagrees — the same tool under different cipher options. Inferred from the family, not observed directly.

What this fingerprint encodes

JA4_a t00d990100 handshake shape, human-readable
JA4_b 523035705075 truncated hash of the cipher list
JA4_c 000000000000 truncated hash of extensions + signature algorithms
Transport
TCP
TLS version
unknown (00)
Server name
server name sent
Cipher suites offered
99
Extensions offered
1
ALPN
none offered

Same tool, different options

These 8 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 1.0

Cipher suites 154

Extensions 1

Raw JA3 string
769,1-2-3-4-5-6-7-8-9-10-14-15-16-20-21-22-47-49-51-53-55-57-59-60-61-63-65-67-69-96-97-98-100-103-105-107-132-134-136-150-152-154-156-157-158-159-160-161-186-188-190-192-194-196-5815-5817-49163-49164-49165-49166-49167-49168-49169-49170-49171-49172-49179-49182-49185-49191-49192-49193-49194-49199-49200-49201-49202-49212-49213-49216-49217-49220-49221-49228-49229-49230-49231-49232-49233-49234-49235-49236-49237-49248-49249-49250-49251-49270-49271-49272-49273-49274-49275-49276-49277-49278-49279-49290-49291-49292-49293-49308-49309-49310-49311-49312-49313-49314-49315-49411-49412-49413-49414-52243-52245-52392-52394-4865-4866-4867-4868-4869-58384-58385-58386-58387-58398-58399-65278-65279-65408-65409-65410-65411-65504-65505-198-199-57369-57370-57372-57433-57434-255,0,,

Seen in live traffic

Connections
1
First seen
2026-10-20 22:31 UTC
Last seen
2026-10-20 22:31 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.