inet in erlang

inet.hrl

-type hostname() :: atom() | string().
-type ip4_address() :: {0..255,0..255,0..255,0..255}.
-type ip6_address() :: {0..65535,0..65535,0..65535,0..65535,
      0..65535,0..65535,0..65535,0..65535}.
-type ip_address() :: ip4_address() | ip6_address().
-type ip_port() :: 0..65535.

-record(hostent,
  {
   h_name     :: hostname(),  %% offical name of host
   h_aliases = []   :: [hostname()],  %% alias list
   h_addrtype   :: 'inet' | 'inet6',  %% host address type
   h_length   :: non_neg_integer(), %% length of address
   h_addr_list = [] :: [ip_address()] %% list of addresses from name server
  }).