Free tool

SPF checker

Check basic SPF publication and catch two common errors: no record or multiple records at the same name.

Check domain

What it checks

Single record

SPF requires one `v=spf1` policy per name.

Mechanisms

Counts direct terms that can trigger DNS lookups.

Explanation

Shows why complete validation still needs recursive includes and real-message testing.

How to interpret the limits

The displayed count does not expand `include` trees.

It does not confirm whether a specific IP is authorized.

It does not evaluate DMARC alignment of Return-Path.

Safe use and privacy

Enter only public domains you are authorized to review. Queries are not stored; private IPs, localhost, reserved ranges, and mixed destinations are blocked. Results are point-in-time public metadata.

Frequently asked questions

Is the queried domain stored?

No. The tool processes the lookup to respond and does not persist the domain or result.

Can I check an IP or internal service?

No. Only public domains are accepted; direct IPs and private, local, or reserved destinations are blocked.

Move from a check to monitoring

A spot check helps diagnosis. Monitoring keeps history and warns you when evidence changes.

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