Typically, an enterprise requesting IPv6 addresses will receive a prefix length block of addresses of what size?

The typical allocation size for an enterprise requesting IPv6 addresses is a /48 prefix. This size is considered ideal for most organizations, allowing them to create a large number of subnets within their network. With a /48 prefix, an enterprise can have 65,536 individual /64 subnets, which is more than sufficient for most internal network architectures.

Using a /48 also aligns with the practice of allocating address space based on the needs of the organization, while reserving the /64 subnet for each individual segment of the network to facilitate autoconfiguration and other advanced features of IPv6.

In contrast, options like /32 and /64 serve different purposes in the IPv6 allocation hierarchy; /32 is generally reserved for larger ISPs or organizations needing vast address space, while /64 is commonly assigned for individual subnets. A /128 address is for a specific interface and is not suitable for general allocation to enterprises. This emphasizes how /48 strikes the right balance for businesses requiring extensive networking capabilities without delving into overly expansive allocations.