Use Regexp::IPv6, IPv4, and/or any of several other modules available on CPAN.

use Regexp::IPv6 qw($IPv6_re);
use IPv4;

my $address = ; # Add your address here.

if ($address =~ /^$IPv6_re$/) { 
    print "IPv6\n";
} elsif (IPv4::check_ip($address)) { 
    print "IPv4\n"; 
} else { 
    print "Neither.\n";
}
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