How to migrate DNS between providers without downtime?

Zero-downtime DNS migration:

Preparation (days before):

Lower TTL to 300-600 seconds on all records

Wait for old TTL to expire

Document all existing records

Setup:

Create zone at new DNS provider

Copy all records exactly

Verify records match using both providers' direct queries

Cutover:

Change nameservers at registrar

Both old and new providers serve records during transition

Monitor for any service disruptions

Post-migration:

Verify all records via external tools

Raise TTL back to normal values

Decommission old DNS zone after full propagation

Open the new harbor office before closing the old one. Run parallel operations during transition.