Email blocklist · DNSBL · Domain names
TUE · 28 JUL 2026
Spamhaus DBL
About
Spamhaus' domain-name list. Standard inclusion alongside ZEN in modern mail filtering.
Listing criteria
Domain-name blocklist covering spamvertised domains, malware and phishing sites, suspicious nameservers, and known abuse origins. Distinct from the IP-based lists; queried with a domain name rather than an IP.
How to query
For an IP address 1.2.3.4, query reversed-octets-dot-zone:
dig +short 4.3.2.1.dbl.spamhaus.orgA returned IP (such as 127.0.0.2) means listed. Each blocklist has its own set of return codes meaning different things; the operator's documentation explains theirs.