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113.57.187.244 has a threat confidence score of 34%. This IP address from China (AS4837, CHINA UNICOM China169 Backbone) has been observed in 2 honeypot sessions targeting SIP, SMTP protocols. First observed on March 13, 2026, most recently active April 20, 2026.
SIP request using sip:nm as the Request-URI, a malformed or placeholder target commonly observed in SIP scanning and fuzzing activity rather than legitimate client behavior.