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35.78.173.66 has a threat confidence score of 97%. This IP address from Japan (AS16509, Amazon.com, Inc.) has been observed in 559 honeypot sessions targeting SIP protocols. First observed on April 21, 2026, most recently active April 21, 2026.
Represents automated SIP reconnaissance activity characterized by multiple unauthenticated SIP methods (such as REGISTER and INVITE) issued using bot-like Call-ID formats. This behavior indicates an attempt to enumerate valid SIP users, extensions, or call routing behavior by systematically probing a SIP service without establishing legitimate registration or dialog context. The use of a numeric-only, hyphen-delimited Call-ID format across different SIP methods strongly suggests an automated scanner or fraud bot rather than a legitimate user agent.