EPP for Developers: Registry–Registrar Communication Explained
A complete, developer-focused course on the Extensible Provisioning Protocol (EPP), the standard protocol used between domain registries and registrars. The course covers the domain name ecosystem, the history and design of EPP, its XML structure and transport over TCP/TLS, session management, the core command set, the three main EPP objects (domain, contact, host) and their relationships, result codes, poll messaging, transfers, and the extension mechanism including secDNS, launch phase, and fee extensions. It closes with practical implementation guidance for building a production-grade EPP client.