diff --git a/xtr.pl b/xtr.pl
index 4b9b2cf..73a5131 100644
--- a/xtr.pl
+++ b/xtr.pl
@@ -10,6 +10,8 @@ use Socket;
 use DBI;
 use File::Fetch;
 use PerlIO::gzip;
+use LWP::UserAgent;
+use HTTP::Request;
 use Data::Dumper;
 
 ### README
@@ -19,6 +21,16 @@ use Data::Dumper;
 ### vars
 my $dbfile = "ip2asn.db";
 my $ip2asn_csv_url = 'http://iptoasn.com/data/ip2asn-v4-u32.tsv.gz';
+my $master_server = "xtr-master.xicon.eu";
+my $my_ip = get_my_ipv4();
+my $my_ext_ip = ""; # set different ip, if access differs from default public ip
+my $my_port = 3000;
+my $my_ext_port = 0; # set different port, if public access port differs from app port
+
+### set vars
+set port => $my_port;
+if($my_ext_ip eq "") { $my_ext_ip = $my_ip; }
+if($my_ext_port eq 0 || $my_ext_port eq "") { $my_ext_port = $my_port; }
 
 ### connect to database
 my $dbh = DBI->connect("dbi:SQLite:dbname=$dbfile","","");
@@ -39,12 +51,41 @@ get '/:ip' => sub {
 	return encode_json $trace;
 };
 
+### give the master server the info, that we are available
+if(send_server_status($master_server,$my_ext_ip,$my_ext_port,"1"))
+{
+	print "send the master server ".$master_server." the info, that we are online.\n";
+}
+else
+{
+	print "Failed to send our status to the master server ".$master_server." - nobody knows we are online :(\n";
+}
+
+### catch "INT" signal to send the status to the master server
+$SIG{'INT'} = sub { send_server_status($master_server,$my_ext_ip,$my_ext_port,"0"); exit; };
+
 ### start the loop
 start;
 
 ### if you reach this, you're done
 exit;
 
+sub send_server_status
+{
+	my ($master_server,$hostname,$port,$status) = @_;
+	my $url = "http://".$master_server."/v2/server/".$hostname."/".$port."/".$status;
+	my $ua = LWP::UserAgent->new(timeout => 10);
+	my $req = HTTP::Request->new("PUT", $url);
+	my $response = $ua->request($req);
+	return $response->is_success;
+}
+
+sub get_my_ipv4
+{
+	my $ua = LWP::UserAgent->new(timeout => 10);
+	my $response = $ua->get("http://ipv4.xicon.eu/");
+	return $response->decoded_content;
+}
 
 sub traceit
 {