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join.ipaddresses(4)
NAME
  join.ipaddresses - Acceptable formats for string representations of IP
  addresses

DESCRIPTION
  A character string representation of an IP address, as used within JOIN, is
  written as one, two, three or four numeric fields with a period, '.',
  separating each field, and without interleaving whitespace.  Each field
  corresponds to an octet, so can have a value in the range 0..255 (decimal).
  Each of the octets may be written as a decimal, octal, or hexadecimal
  number, and there is no requirement that each octet have the same radix.
  Octal values commence with a leading zero '0'; hex values commence with
  either '0x' or '0X'.

  When an address is written with fewer than four octets, the missing bytes
  are interpolated according to the following scheme, which shows how they
  would have been written with all four octets present:

  aaa.bbb.ddd	   aaa.bbb.0.ddd

  aaa.ddd	   aaa.0.0.ddd

  ddd		   0.0.0.ddd

EXAMPLES
  192.245.139.33
  0xc0.245.139.041
  192.33
  0x21

RELATED INFORMATION
  Functions: inet_addr(3).

  Information: dhcp(7)