Multi-provider (secondary) DNS

Two ways to do it

• Primary and secondary: one provider holds the zone and the other copies it with zone transfers (AXFR/IXFR), usually triggered by NOTIFY. Needs a provider that can act as a secondary.
• Two primaries kept in sync: you write the same records to both providers through their APIs. Works with any two providers that have an API.

What has to be true

• Both providers serve identical records. Use only standard record types; proxying, apex aliases, flattening and routing policies differ between providers.
• The delegation at the registrar lists nameservers from both providers.
• Each zone's apex NS record set lists all nameservers from both providers.
• DNSSEC is either off, or set up as multi-signer (RFC 8901) with both providers' keys published.

Keeping two providers in sync

DNSMigrator can manage a zone on several providers at once: you edit records in one place, the preview shows the plan for each provider, and drift checks alert you if someone changes a record directly at one of them. See pricing for plans that include continuous sync.