Introduction to Azure Virtual Networks

Replace the domain's name servers at the registrar with all four name servers assigned to the Azure DNS zone.

Replace the existing provider's zone-apex NS records with Azure name servers while keeping the registrar settings.

Change the SOA primary name server in the existing provider's zone to a name server assigned to Azure DNS.

Create a CNAME record for the website at the existing provider that targets a name server assigned to Azure DNS.

Configure an AXFR zone transfer from the existing provider to the name servers assigned to the Azure DNS zone.