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INTERNET ADDRESSES (IP VERSION 4)
     The inet_aton() and inet_addr() functions accept IPv4 values specified
     using the ‘.’ notation in one of the following forms:

           a.b.c.d
           a.b.c
           a.b
           a

     When four parts are specified, each is interpreted as a byte of data and
     assigned, from left to right, to the four bytes of an Internet address.

     When a three part address is specified, the last part is interpreted as a
     16-bit quantity and placed in the least significant two bytes of the
     network address.

     When a two part address is supplied, the last part is interpreted as a
     24-bit quantity and placed in the least significant three bytes of the
     network address.

     When only one part is given, the value is stored directly in the network
     address without any byte rearrangement.

     All numbers supplied as “parts” in a ‘.’ notation may be decimal, octal,
     or hexadecimal, as specified in the C language (i.e., a leading 0x or 0X
     implies hexadecimal; otherwise, a leading 0 implies octal; otherwise, the
     number is interpreted as decimal).

     Note that inet_pton() does not accept 1-, 2-, or 3-part dotted addresses;
     all four parts must be specified and are interpreted only as decimal
     values.  This is a narrower input set than that accepted by inet_aton().