in reply to Checking IP's with an IP/mask

Unfortunately, this is a terse answer, as I haven't done this myself before, but Net::Netmask should do the trick for you, I'd think.

use Net::Netmask;

$block=new Net::Netmask("10.0.2.0/24");
if ($block->match("192.168.1.2")) { ... }

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Update: added code example 

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Re: Re: Checking IP's with an IP/mask
by idnopheq (Chaplain) on Apr 24, 2001 at 14:00 UTC
    OUTSTANDING! 

    #!/usr/bin/perl -wT
#-*-perl-*-

use strict;
use Net::Netmask;

my $block=new Net::Netmask( $ARGV[0] );

if ($block->match( $ARGV[1] ) ) { 
  print $ARGV[1] , " exists in " , $ARGV[0] , "\n";
}

else {
  print "CIDR         = " , $block->desc() , "\n";            # a.b.c.
+d/bits
  print "IP Address   = " , $block->base() , "\n";
  print "Netmask      = " , $block->mask() , "\n";
  print "Hostmask     = " , $block->hostmask() , "\n";
  print "Mask bits    = " , $block->bits() , "\n";
  print "Subnet size  = " , $block->size() , "\n";
  print "Max netmask  = " , $block->maxblock() , "\n";
  print "Broadcast    = " , $block->broadcast() , "\n";
  print "Next netmask = " , $block->next() , "\n";
  print "First host   = " , $block->nth(1) , "\n";
}

    [download]

    I wish I had found this module a few years ago! My binary math is quite slow.

    THX!
    --
    idnopheq
    Apply yourself to new problems without preparation, develop confidence in your ability to to meet situations as they arrise.

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