Blacklist Check

Check a public IP address against supported DNS blocklists. Review provider results and lookup limitations with My Secure Labs.

How to use Blacklist Check

Enter a public IPv4 address or a domain with public IPv4 records. Private, reserved, malformed addresses, URLs and subnet ranges are rejected. IPv6 is not supported by the configured DNS blocklists.

Understanding the results

For a domain, review the resolved IPv4 addresses and provider results for each address. This checks IP reputation, not domain or mail-server reputation. At most 16 unique IPv4 addresses are tested; any omitted addresses are shown. Unavailable checks do not establish a clean result.

Does checking a domain test its email server’s blacklist status?

This tool checks the domain’s resolved IPv4 addresses. A mail server may use a different address. Find its hostname in the MX records, resolve that hostname, then check the relevant public IPv4 address.