SecDNS
Dashboard/Tools

Reputation

Blocklist Check

Check whether a domain appears on the SecDNS RPZ feed or well-known public DNSBLs (Spamhaus DBL, SURBL, SpamCop). Live DNS queries — no caching, no sign-in.

Blocklist verdicts

Enter a value above to run a lookup.

Frequently asked questions

What is a domain blocklist?

A domain blocklist (DNSBL) publishes “bad” domains over DNS. Receivers query <domain>.<zone>; an A response means listed. The most widely used domain-reputation list is Spamhaus DBL.

Which lists do you check?

Three public reputation feeds — Spamhaus DBL, SURBL multi, and SpamCop — plus a placeholder slot for the SecDNS RPZ feed. Every check is a live DNS query, no caching.

My domain is listed — how do I get off?

Each list has its own removal flow. Spamhaus DBL: send a request from the postmaster mailbox at the listed domain. SURBL: open a ticket via their web form. SpamCop: same. Make sure you’ve fixed the underlying issue first (compromised account, open relay, hijacked redirect).

How does the SecDNS RPZ check work?

SecDNS publishes a Response-Policy-Zone feed to subscribers. The public tool currently shows a placeholder verdict (`private_resolver_required`) — only authenticated customers can run live RPZ checks via the customer dashboard. The slot stays in the result table so the UI is stable.

Is this the same as the SecDNS DNS Security Audit?

No. The DNS Security Audit runs 25+ checks across SPF, DMARC, DNSSEC, AXFR, and more, and produces a risk-scored shareable report. Blocklist Check is a quick-look tool focused only on reputation feeds.