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77.83.39.71 has a threat confidence score of 50%. This IP address from Ukraine (AS214940, Kprohost LLC) has been observed in 42 honeypot sessions targeting SMTP protocols. First observed on March 8, 2026, most recently active March 25, 2026.
Automated SMTP interaction performing a minimal capability check by issuing EHLO followed by a STARTTLS upgrade request and immediately terminating the session. This pattern is commonly associated with internet-wide scanners, security research crawlers, or opportunistic bots verifying whether an SMTP service supports encrypted communication. The absence of authentication attempts or message submission indicates reconnaissance or service fingerprinting rather than active abuse.