Severe Risk
IP 45.156.87.211 is a high-risk address associated with 846 total abuse reports and confirmed hacking activity, representing a persistent threat to exposed network services. Operating from the Netherlands through Pfcloud UG (AS51396), this IP has been actively targeting systems since November 2025, according to automated honeypot sensor detections and community reporting feeds.
Analysis of the available data reveals a significant threat profile. The IP accumulated 846 total reports with a 76% confidence score, of which 20 recent reports specifically categorize the activity as hacking attempts including intrusion and exploitation behaviors. All 20 report sources were identified through automated honeypot sensors, indicating systematic, automated attack infrastructure rather than opportunistic scanning. The activity window spans November through December 2025, suggesting sustained rather than transient malicious behavior. Geographic placement in the Netherlands and association with Pfcloud UG provides network context, though abuse-friendly hosting environments frequently obscure true attribution.
Hacking activity in this context refers to structured intrusion attempts, vulnerability exploitation, and unauthorized access campaigns rather than simplistic scanning. Real-world risk includes credential compromise, data exfiltration, malware deployment, and pivot attacks against internal network infrastructure. Systems exposing services such as SSH, RDP, VNC, web applications, or administrative interfaces face the greatest exposure. Even low activity frequency scores do not diminish the danger posed by repeat offenders with established abuse histories, as attack campaigns often operate intermittently to evade detection thresholds.
Defensive measures should include immediate blocking of this IP at the network perimeter firewall level given its maximum threat classification. Implementing fail2ban, CrowdSec, or similar dynamic blocking tools provides automated response to repeated connection attempts. Operators should enforce strong authentication requirements—key-based authentication for SSH, multi-factor authentication for administrative interfaces—and ensure all exposed services run current security patches. Continuous monitoring of authentication logs for patterns associated with this address and similar sources enables rapid incident response and helps refine site-specific threat intelligence.
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