RFC 4632 (Request for Comments 4632)

RFC 4632 outlines a method for representing the size of IP address blocks allocated to organizations. It uses a notation called Classless Inter-Domain Routing (CIDR), which simplifies IP address management by specifying both the network address and the number of bits used for the network prefix. This helps improve routing efficiency, conserve IP addresses, and clearly indicate how much address space an entity has. For example, "192.168.0.0/24" indicates a specific address range. Essentially, RFC 4632 provides best practices for allocating, documenting, and announcing IP address blocks in a clear, consistent way.