An IP address consists of a:

A standard IPv4 address is a 32 bit number, usually written as four decimal octets separated by dots.

A 16 bit value is far too small and would allow only about 65 thousand addresses.

A 64 bit width does not describe IPv4 and overstates the space it defines.

A 96 bit width also fails to match IPv4 and is not a real address length here.

32 bits give roughly 4.3 billion possible addresses.

The newer IPv6 scheme uses 128 bits to expand the address space enormously.