Domain Blacklist Check — DNSBL Lookup Online

101IP checks your domain's reputation against 8 URI DNSBL databases. If a domain is listed, emails from that domain may be rejected by spam filters.

Databases checked

• Spamhaus DBL — industry standard; distinguishes spam, phishing, malware and botnet C&C domains;
• URIBL Black / Grey / Red — domains found in spam messages: Black (spam only), Grey (mixed), Red (unconfirmed);
• SURBL Multi — combined SURBL list covering phishing, spam and malware domains;
• SORBS RHSBL — right-hand side blacklist for sender domain reputation;
• SEM Fresh — recently registered domains observed in spam campaigns.

Domain vs IP blacklist

An IP blacklist checks the sending mail server's reputation. Domain Blacklist checks the domain itself as it appears in message bodies, links and sender addresses. Both are important for diagnosing email deliverability issues.

How to remove a domain from the blacklist

• Visit the DNSBL's website and submit a delisting request;
• Ensure the domain is not being used to send spam or phishing messages;
• Scan the website for malware or compromised content;
• Set up SPF, DKIM and DMARC records to prevent future listings.