Check if the IP address is in the subnet

On the Internet, many solutions to this problem, I also searched for it, but I did not like solutions because I didn’t like it with my performance. In Perl, there is the Net :: Patricia package, which solves this problem very effectively, the method is based on the Patricia Tree.

You can install this package through CPAN.

perl -MCPAN -e shell
install Net :: Patricia
')
After installation, you can use this package as follows:

#!/usr/bin/perl -w
use Net::Patricia;
# IP tools
my $pt = new Net::Patricia;
$pt->add_string('212.44.12.0/24');
if(defined($pt->match_string('212.44.12.3'))){
print "IN\n";
}else{
print "OUT\n";
}