Free spam blacklist check tool

Lookup IP and domain of your mail server on comprehensive database of spam blacklists also called DNSBL.

Check your mail server IP address against 162 DNSBL. Do you know domain name can be blacklisted too? Lookup 48 domain blacklists - URIBL.

 

IP address, host name or domain name:    
Check blacklists: IP address blacklist - DNSBL
Domain name blacklist - URIBL

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What is DNSBL?

DNSBL is DNS based spam block list. It is a database of IP addresses and domain names that supposedly are source of email spam. Most mail servers and spam filtering systems use DNSBL. If your domain name or mail server IP address is in the list, email you send may be rejected or stuck in the spam folder. Blacklists that contain blacklisted domain names are often called URIBL.