Security and privacyAvailable

DNSBL Lookup for Public IP Addresses

Prepare public IPv4 addresses for a manual DNSBL lookup and, when the site operator has approved specific zones, inspect their exact DNS responses.

Protected server-side checkNo permanent storage by default

Request scope

The check uses the public domain and only the DNS, RDAP or TLS requests described below.

About this check

What the tool checks

The default mode does not query third-party DNSBL zones automatically. It prepares each public address and links to an official manual lookup; explicitly permitted zones can be enabled separately.

How this check works

Public IPv4 addresses are resolved and converted to their reversed lookup form. Automated DNS queries run only for zones that the site operator has explicitly configured after reviewing their terms.

What this check cannot establish on its own

The default mode is not a blacklist result. No individual DNSBL covers every reputation system, and each operator defines its own scope, access terms and correction process.

Data sources

Resolved public IPv4 addresses, the official Spamhaus manual lookup and, when permitted, the exact DNS responses from each named configured zone.
https://www.spamhaus.org/blocklists/dnsbl-fair-use-policy/

DNSBL Lookup for Public IP Addresses

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