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Extensible Provisioning Protocol
Extensible Provisioning Protocol (EPP) is a flexible application layer protocol designed for reliable and secure communications between Internet domain name registrars and registries. Standardized in RFC 5734, it facilitates operations such as domain registration, management, and transfer. EPP primarily uses XML over TCP for structured data exchange and has become the industry standard for automated provisioning within domain name systems..
Overview: Extensible Provisioning Protocol (EPP) operates at the application layer, utilizing XML messages transmitted over TCP connections—typically on port 700. It provides a standardized, extensible framework that enables registrars to automate interactions with domain registries for domain name management tasks.
Protocol Specifications: EPP defines command and response formats encoded in XML compliant with RFC 5734. It supports fundamental provisioning operations such as register, renew, transfer, delete, and update of domain objects, as well as management of contact and host objects. TCP is preferred due to its reliability, ensuring transactional integrity during communications.
Extensibility: The protocol includes extension mechanisms that allow registries to introduce custom commands without breaking compatibility, making it adaptable for diverse registry needs. While EPP itself does not enforce encryption or authentication, it is typically implemented over secure channels like TLS to safeguard data during transmission.