An engineer is designing an address plan. Which IPv6 prefix removes any consideration regarding the number of hosts per subnet?

A /32 prefix is the allocation size typically assigned to large ISPs by Regional Internet Registries; it represents an entire address block, not a single subnet.

A /48 prefix is the standard allocation size for an organization or site, providing 2^16 possible /64 subnets within it, but it is not a subnet prefix itself.

With a /64 prefix, the remaining 64 bits form the interface identifier, yielding 2^64 possible addresses per subnet - a number so large that host density is never a constraint. Additionally, IPv6 Stateless Address Autoconfiguration (SLAAC) requires exactly a /64 prefix to function, making it the universal standard for IPv6 subnets.

A /96 prefix still limits the interface identifier to 32 bits, yielding only 2^32 addresses per subnet - equivalent to the entire IPv4 address space - which does not eliminate host-count considerations the way a /64 does.