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51.89.198.5 has a threat confidence score of 96%. This IP address from United Kingdom (AS16276, OVH SAS) has been observed in 163 honeypot sessions targeting SIP protocols. First observed on March 25, 2026, most recently active March 26, 2026.
Represents an automated SIP INVITE request likely generated by a scanner or bot rather than a legitimate user agent. The behavior is inferred from a combination of a numeric-only SIP Call-ID format and a direct INVITE to a long numeric target without prior registration or dialog context. This pattern is commonly associated with SIP service probing, extension discovery, or early-stage toll-fraud reconnaissance. This behavior indicates reconnaissance activity against a SIP service but does not, by itself, confirm successful call setup or financial abuse.