JA4 t13d101200_01be160bb49b_d42405ff081a

t13d101200_01be160bb49b_d42405ff081a

Shares its JA4_c (d42405ff081a) with 1 fingerprint classified as browser, 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

Transport

TCP

TLS version

TLS 1.3

Server name

server name sent

Cipher suites offered

10

Extensions offered

12

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.

• t13d201200_2b729b4bf6f3_d42405ff081a

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 10

• TLS_AES_256_GCM_SHA384
• TLS_AES_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

Extensions 12

• server_name
• supported_versions
• signature_algorithms
• session_ticket
• supported_groups
• ec_point_formats
• key_share
• post_handshake_auth
• extended_master_secret
• renegotiation_info
• psk_key_exchange_modes
• pre_shared_key

Named groups 2

• secp384r1
• secp256r1

Point formats 1

• uncompressed

771,4866-4865-49200-49199-49192-49191-49196-49195-49188-49187,0-43-13-35-10-11-51-49-23-65281-45-41,24-23,0

Seen in live traffic

Connections

2

First seen

2026-09-16 16:14 UTC

Last seen

2026-09-16 16:14 UTC

Transport

TCP

User-Agents seen on this fingerprint

• Mozilla/5.0 (Windows NT 6.1; WOW64) SkypeUriPreview Preview/0.5 skype-url-preview@microsoft.com 2×

A User-Agent is self-declared and trivially forged, so this names an observation rather than proving an identity. It is still the strongest signal available: the fingerprint comes off the TLS handshake and the User-Agent off the request that followed, and one client build keeping a stable JA4 while changing what it calls itself is a finding in its own right.

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.