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12. IANA Considerations

This specification defines several new IANA registries for CoAP to ensure interoperability between implementations and provide a framework for future protocol extensions.

12.1. CoAP Code Registries​

IANA maintains registries for CoAP method codes and response codes.

12.1.1. Method Codes​

Initial registrations include GET (0.01), POST (0.02), PUT (0.03), and DELETE (0.04).

12.1.2. Response Codes​

Response codes are categorized into success (2.xx), client error (4.xx), and server error (5.xx) classes.

12.2. CoAP Option Numbers Registry​

IANA maintains a registry of CoAP option numbers for protocol extensibility.

12.3. CoAP Content-Formats Registry​

Defines numeric identifiers for common media types used with CoAP.

12.4-12.8. URI Schemes and Port Registrations​

Includes registrations for coap/coaps URI schemes, service names, port numbers (5683/5684), and multicast addresses.

These registries ensure interoperability between CoAP implementations.

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