How to migrate DNS between providers without downtime?

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.

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