Free tools
Nine DNS & email tools, no account
All nine are free, and none of them need an account. Most take a domain and look up what its DNS actually says right now.
The record builders and the report converter work differently: they run entirely inside your browser, so the keys, policies and report files you paste into them never leave your machine.
- Domain Checker DNS lookup Combined SPF, DKIM, DMARC, MX, MTA-STS and TLS-RPT overview for a domain — the fastest way to see the whole picture.
- DMARC Inspector DNS lookup Fetch and parse a domain's DMARC record, flag policy issues, and check external report-destination authorization.
- SPF Check DNS lookup Expand the include: tree and count DNS lookups against the hard limit of 10.
- DKIM Inspector DNS lookup Look up a selector and parse its tags — key type, length, and testing-mode flag.
- DKIM Validator DNS lookup Confirm a public key parses, check its algorithm and key length, and detect revocation.
- MTA-STS Checker DNS lookup Check the record, fetch the policy file over HTTPS, and confirm its mx list still matches the domain's real MX records. Includes TLS-RPT.
- MTA-STS Policy Generator In your browser Build the policy file and every DNS record it needs, including TLS-RPT. Nothing you enter is uploaded.
- DMARC Record Wizard In your browser Step-by-step builder for a valid DMARC record. Nothing you enter is uploaded.
- XML-to-human Converter In your browser Aggregate report XML, .gz or .zip to a readable summary. The report never leaves your machine.
Beyond the tools
Turn a one-off check into ongoing monitoring
The tools show you a domain right now. DMARCLoop watches it over time, reads the reports, and tells you when it's safe to tighten — on the free plan, no card needed.