Email blocklist · DNSBL · IP addresses
TUE · 28 JUL 2026
Barracuda Reputation Block List
About
Barracuda's public-facing reputation list. Requires registration to query (a registered referrer IP). Useful as a secondary check alongside Spamhaus.
Listing criteria
IPs observed sending spam to Barracuda's installed base. Largely overlaps with Spamhaus for the worst offenders; useful as a secondary signal.
How to query
For an IP address 1.2.3.4, query reversed-octets-dot-zone:
dig +short 4.3.2.1.b.barracudacentral.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.