Reputation and Blocklists

Blacklist Checker

Check an IPv4 address or domain against free public blacklist sources, see which providers flagged it, and review resolved IP reputation without needing a paid account.

IPv4 DNSBL lookups Domain RHSBL checks Resolved IPs checked automatically

IPv4 Address or Domain

Try: 8.8.8.8 | example.com | mail.google.com

At a Glance

Free-source checks, clearly separated

This public tool uses only free public DNSBL and RHSBL-style lookups. It is useful for a quick reputation screen, but it should be treated as best-effort rather than a complete commercial monitoring service.

IP Checks a curated set of public DNSBL providers with no paid API key.

Domain Runs direct domain denylist checks and resolves IPv4 addresses automatically.

Transparent Every provider and lookup zone is shown with the exact query result.

Limits Coverage varies by provider, and some public blocklists are intentionally narrow.

DNS Checker Inspect MX, TXT, SPF, DKIM, and DMARC records. Domain Intel Review broader ownership and trust signals.

Results Workspace

Blacklist reputation details

Start with the verdict, then inspect provider-level DNSBL responses and raw JSON only when you need the detail.