sub gethost{
        my ($val)=@_;
        if($val=~/(\d+\.\d+\.\d+\.\d+)/){
                my $host=gethostbyaddr(inet_aton($1),AF_INET);
                return $host;
        }
        return "";
}

##</code><code>##

if(/\s*Listen\s+(\S*)/){
       $instdetails{$instnum}{Listen}{$1}=1;
       $instdetails{$instnum}{Listen}{$1}{host}=gethost($1);
       print ERR "$instnum $listen $instdetails{$instnum}{Listen}{$1}{host}";
       next;
}