Net::IPv4Addr(3) User Contributed Perl Documentation Net::IPv4Addr(3)

Net::IPv4Addr

   Net::IPv4Addr - Perl extension for manipulating IPv4 addresses.
perldoc Net::IPv4Addr
     use Net::IPv4Addr qw( :all );

     my ($ip,$cidr) = ipv4_parse( "127.0.0.1/24" );
     my ($ip,$cidr) = ipv4_parse( "192.168.100.10 / 255.255.255.0" );

     my ($net,$msk) = ipv4_network( "192.168.100.30" );

     my $broadcast  = ipv4_broadcast( "192.168.100.30/26" );

     if ( ipv4_in_network( "192.168.100.0", $her_ip ) ) {
       print "Welcome !";
     }

     etc.
   Net::IPv4Addr provides functions for parsing IPv4 addresses both in
   traditional address/netmask format and in the new CIDR format.  There
   are also methods for calculating the network and broadcast address and
   also to see check if a given address is in a specific network.
   All of Net::IPv4Addr functions accepts addresses in many format. The
   parsing is very liberal.

   All these addresses would be accepted:

       127.0.0.1
       192.168.001.010/24
       192.168.10.10/255.255.255.0
       192.168.30.10 / 21
       10.0.0.0 / 255.0.0.0
       255.255.0.0

   Those wouldn’t though:

       272.135.234.0
       192.168/16

   Most functions accepts the address and netmask or masklength in the
   same scalar value or as separate values. That is either

       my($ip,$masklength) = ipv4_parse($cidr_str);
       my($ip,$masklength) = ipv4_parse($ip_str,$msk_str);
   No functions are exported by default. Either use the ":all" tag to
   import them all or explicitly import those you need.

ipv4_parse

           my ($ip,$msklen) = ipv4_parse($cidr_str);
           my $cidr = ipv4_parse($ip_str,$msk_str);
           my ($ip) = ipv4_parse($ip_str,$msk_str);

       Parse an IPv4 address and in scalar context the address in CIDR
       format and in an array context the address and the mask length.

       If the parameters doesn’t contains a netmask or a mask length, in
       scalar context only the IPv4 address is returned and in an array
       context the mask length is undefined.

       If the function cannot parse its input, it croaks. Trap it using
       "eval" if don’t like that.

ipv4_network

           my $cidr = ipv4_network($ip_str);
           my $cidr = ipv4_network($cidr_str);
           my ($net,$msk) = ipv4_network( $net_str, $msk_str);

       In scalar context, this function returns the network in CIDR format
       in which the address is. In array context, it returns the network
       address and its mask length as a two elements array. If the input
       is an host without a netmask of mask length, the default netmask is
       assumed.

       Again, the function croak if the input is invalid.

ipv4_broadcast

           my ($broadcast) = ipv4_broadcast($ip_str);
           my $broadcast   = ipv4_broadcast($ip_str,$msk_str);

       This function returns the broadcast address. If the input doesn’t
       contains a netmask or mask length, the default netmask is assumed.

       This function croaks if the input is invalid.

ipv4_network

           my $cidr = ipv4_network($net_str);
           my $cidr = ipv4_network($cidr_sstr);
           my ($net,$msk) = ipv4_network( $ip_str, $mask_str);

       In scalar context, this function returns the network in CIDR format
       in which the address is. In array context, it returns the network
       address and its mask length as a two elements array. If the input
       is an host without a netmask or mask length, the default netmask is
       assumed.

       Again, the function croak if the input is invalid.

ipv4_in_network

           print "Yes" if ipv4_in_network( $cidr_str1, $cidr_str2);
           print "Yes" if ipv4_in_network( $ip_str1, $mask_str1, $cidr_str2 );
           print "Yes" if ipv4_in_network( $ip1, $mask1, $ip2, $msk2 );

       This function checks if the second network is contained in the
       first one and it implements the following semantics :

          If net1 or net2 is a magic address (0.0.0.0 or 255.255.255.255)
          than this function returns true.

          If net1 is an host, net2 will be in the same net only if
          it is the same host.

          If net2 is an host, it will be contained in net1 only if
          it is part of net1.

          If net2 is only part of net1 if it is entirely contained in
          net1.

       Trap bad input with "eval" or else.

ipv4_checkip

           if ($ip = ipv4_checkip($str) ) {
               # Do something
           }

       Return the IPv4 address in the string or undef if the input doesn’t
       contains a valid IPv4 address.

ipv4_cidr2msk

           my $netmask = ipv4_cidr2msk( $cidr );

       Returns the netmask corresponding to the mask length given in
       input.  As usual, croaks if it doesn’t like your input (in this
       case a number between 0 and 32).

ipv4_msk2cidr

           my $masklen = ipv4_msk2cidr( $msk );

       Returns the mask length of the netmask in input. As usual, croaks
       if it doesn’t like your input.
   Francis J. Lacoste <francis.lacoste@iNsu.COM>
   Copyright (c) 1999, 2000 iNsu Innovations Inc.  All rights reserved.

   This program is free software; you can redistribute it and/or modify it
   under the terms as perl itself.
   perl(1) ipv4calc(1).

perl v5.10.1 2000-08-01 Net::IPv4Addr(3)