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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.

In reply to Re^2: Splitting IP ranges depending on overlap conditions by fishbot_v2
in thread Splitting IP ranges depending on overlap conditions by kamesh3183

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