IP Range Blacklist Check
This tool allows you to check the reputation of an IP address or an IP range against the most commonly used DNS-based blacklists (DNSBLs).
If an IP address appears on these lists, it may indicate previous spam activity, abuse, or other malicious behavior.
Spamhaus ZEN: One of the most trusted global DNSBLs, widely used by mail servers to block spam and malicious traffic.
Barracuda: Maintained by Barracuda Networks, listing IPs reported for sending spam.
SpamCop: Lists IP addresses based on user-reported spam activity.
UCEPROTECT Level 1: Lists individual IP addresses reported for spam activity. This level does not list entire networks, but may still be considered aggressive by some mail providers.
Legend:
OK – IP not listed,
LISTED – IP appears on the blacklist.