Network names

As for host names, routines for mapping network names to numbers, and back, are provided. These routines return a netent structure:

   /*
    * Assumption here is that a network number
    * fits in 32 bits -- probably a poor one.
    */
   struct netent {
        char *n_name;         /* official name of net */
        char **n_aliases;     /* alias list */
        int  n_addrtype;      /* net address type */
        int  n_net;           /* network number, host byte order */
   };