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Global symbol "%dns_check" requires explicit package name at dnscheck.
+pl line 7.
Global symbol "$key" requires explicit package name at dnscheck.pl lin
+e 13.
...
Global symbol "%dns_check" requires explicit package name at dnscheck.
+pl line 13.
Global symbol "$key" requires explicit package name at dnscheck.pl lin
+e 14.
Global symbol "$key" requires explicit package name at dnscheck.pl lin
+e 15.

%dns_check = ("address" => "ip");
                
...
    $found_addr = inet_ntoa(inet_aton($key));
    print "IP found is: $found_addr ", "\n";
}