AboutFree templates
Free tool

DNS and email checker

Check a domain before and after a migration: nameservers, MX, SPF, DKIM, DMARC, Autodiscover and website records, with TTLs and plain-English warnings.

Runs in your browserNo sign-upNothing is stored
Microsoft 365 and Google selectors are checked automatically.

How to use it in a migration

  • Before: run it and save the CSV as your "before" record (or use the DNS cutover record sheet). Lower TTLs if they are long.
  • At cutover: after you change MX, SPF, DKIM and Autodiscover, run it again. Lookups use public resolvers, so you see what the internet sees, subject to caching.
  • After: confirm only the new provider's MX remains, SPF includes the new provider, DKIM is found and DMARC reports arrive.

Lookups are made by your browser to Google Public DNS (dns.google), falling back to Cloudflare (cloudflare-dns.com). Cloud-Migrations.au does not see or store the domains you check. Results can lag behind changes until cached records expire. DKIM selectors cannot be listed by DNS, so the tool checks common ones and any you enter.

Step-by-step guides: DNS cutover playbook · check DNS propagation · lower TTL