Measured Risk
IP 213.209.157.225 is a medium-risk German address operated by Moon Dc that has accumulated 341 total abuse reports, with Email Spam identified as the dominant recent threat category through automated honeypot detections. The IP carries a threat level of 5 out of 10 and a confidence score of 59 percent, indicating moderate certainty in the classification. The address was first and most recently reported in October 2025, suggesting activity clustered within a short window rather than sustained over an extended period.
Automated honeypot sensors generated 20 reports specifically categorised as Email Spam activity linked to this address, while the broader report volume of 341 indicates the IP has attracted repeated attention from community monitoring infrastructure. The network is registered in Germany under ASN AS208485, operated by Moon Dc. The activity frequency score of 0 out of 10 suggests that, while reports exist, the observed malicious traffic is not currently operating at high volume. The moderate confidence score of 59 percent reflects some uncertainty in attribution, possibly due to shared infrastructure, NAT usage, or limited direct evidence captured by detection sensors.
Email spam operations represent a concrete threat to any exposed SMTP service, as mass distribution of unsolicited messages can overwhelm mail servers, damage sender reputation for legitimate users on shared infrastructure, and serve as a vector for phishing lures or malware payloads. An IP flagged for SMTP spam or email abuse may be actively probing for open relays, misconfigured mail transfer agents, or weak recipient validation. Even low-volume spamming can indicate reconnaissance activity preceding more targeted attacks. Organisations with exposed mail services should treat this IP as a candidate for blocking or rate-limiting to prevent potential abuse.
Site operators running publicly accessible SMTP services should enforce strict egress and ingress controls, implement SPF, DKIM and DMARC to authenticate legitimate mail and reject spoofed senders, and route inbound mail through reputable filtering services that maintain real-time blocklists. Blocking or challenge mechanisms such as fail2ban applied to repeated SMTP probe patterns can reduce exposure. Continuous monitoring of abuse feeds and log analysis for connections originating from this address will help determine whether the threat is active against specific infrastructure. Where possible, restricting SMTP authentication to known networks and enforcing minimum password complexity provides an additional hardening layer against credential abuse attempts commonly associated with spam originators.
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