Email blocklist · DNSBL · IP addresses MON · 14 SEP 2026

Barracuda Reputation Block List

Operated by Barracuda Networks · United States · Zone b.barracudacentral.org

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.org

A 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.

Operator site Delisting / lookup ›