A registrar API and a DNS interface overlap at the word ‘domain’, but they make different promises. For a gaming platform creating one subdomain per tenant, the registrar path owns registration, nameservers, and transfer state. The DNS path owns records and answers.
Source: [Dev.to](https://dev.to/abernathycross6857/registrar-apis-vs-dns-interfaces-different-jobs-in-a-tenant-migration-n7g)