Tk::Error: Can't call method "reverse_ip" without a package or object reference
at C:\_SCRIPT\Perl\DNS\TkNMLookup.pl line 21.
 Tk callback for .button
 Tk::__ANON__ at C:/Perl/lib/Tk.pm line 252
 Tk::Button::Invoke at C:/Perl/lib/Tk/Button.pm line 135
 <Key-Return>
 (command bound to event)