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Re: Splitting IP ranges depending on overlap conditions

by eXile (Priest)
on Apr 14, 2006 at 15:26 UTC ( #543373=note: print w/replies, xml ) Need Help??

in reply to Splitting IP ranges depending on overlap conditions

I'm not aware of a CPAN module that can do this.

You could convert your dotted-quad IP-addresses to integers, so you can do some simple math with them:

if ( $ip =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ ) { $number = $1 >> 24 + $2 >> 16 + $3 >> 8 + $4 }

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Re^2: Splitting IP ranges depending on overlap conditions
by fishbot_v2 (Chaplain) on Apr 14, 2006 at 17:49 UTC

    TMTOWTDI, and I normally do this sort of thing:

    use strict; use warnings; use Socket qw{ inet_aton inet_ntoa }; sub ip_to_num { unpack( 'N', inet_aton( shift )); } sub ip_to_str { inet_ntoa( pack( 'N', shift )); } sub ip_plus { ip_to_str( ip_to_num( $_[0] ) + $_[1] ); } sub ip_minus { ip_plus( $_[0], -$_[1] ); } my $dotted_quad = ''; print ip_plus( $dotted_quad, 290 ), "\n"; print ip_minus( $dotted_quad, 3 ), "\n"; __END__

    In the OPs case, he only needs to add 1 and subtract 1. Again, all of this craps out on IPv6. I suspect that isn't a concern yet.

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[ambrus]: MLX: if it's a work email, then it's probably not Uncle Sam that matters, but what the account managing server at work thinks your name is. Those can differ. For example, we've had two co-workers with identical real name at one point,
[ambrus]: so one got a stupid suffix in the email account (people have email address based on their real name here usually).

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