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.

             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.

             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.

             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.

             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.

             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.

             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.

             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).

             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)