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109.104.154.105 has a threat confidence score of 42%. This IP address from The Netherlands (AS136258, BrainStorm Network, Inc) has been observed in 4 honeypot sessions targeting SIP protocols. First observed on March 18, 2026, most recently active March 21, 2026.
Automated SIP OPTIONS requests used to validate reachable VoIP endpoints and enumerate service capabilities without initiating a call session. The client sends standalone OPTIONS probes with high-entropy or unusually long Call-ID values, a pattern commonly associated with scripted scanning frameworks or VoIP reconnaissance tooling. Such activity is typically observed during infrastructure discovery phases where attackers identify responsive SIP servers, supported methods, and potential targets for toll fraud, brute-force registration attempts, or later exploitation campaigns.