diff --git a/mxstartup2mxconfig b/mxstartup2mxconfig
index 0cb7244..3ef4259 100755
--- a/mxstartup2mxconfig
+++ b/mxstartup2mxconfig
@@ -112,6 +112,7 @@ sub parse_ips {
     my %ports = ();
     my $ip = "-";
     my $_todest = undef;
+    my $addressprefix;
     
     if(/\{(\S+)\}(\S+)/) {   # extract device "{device}ip[d:t][..]"
       $device = $1;
@@ -126,17 +127,23 @@ sub parse_ips {
     if($_ =~ /(\S+)\:(\S+)/) {
       $_todest = $2;
       $_ = $1;
+    }
+
+    if (/(\S+)\/(\S+)/) {
+        $_=$1;
+        $addressprefix=$2;
     } else {
-      $_todest = $_;
+        $addressprefix=20;
     }
-    
+
     if("$_" eq "-") {
       $_ = $fullhostname;
     }
     
-    if("$_todest" eq "-") {
-      $_todest = $fullhostname;
+    unless (defined $_todest) {
+       $_todest=$_;
     }
+
     
 #    printf "ip = $_\n";
 #    printf "todest = $_todest\n";
@@ -144,7 +151,7 @@ sub parse_ips {
     $ip       = inet_ntoa(scalar gethostbyname($_));
     $_todest  = inet_ntoa(scalar gethostbyname($_todest));
 
-    $H->{$ip} = { device => $device, ports => {%ports}, todest => $_todest } unless($ip eq "-");
+    $H->{$ip} = { device => $device, addressprefix => $addressprefix, ports => {%ports}, todest => $_todest };
   }
   
   return $H;
@@ -195,7 +202,7 @@ sub print_ips_cfg {
     if("$ip" ne "$hostip") {
       print SCRIPT qq(# ip $i\n);
       print SCRIPT qq(MX_IP_ADDRESS[$i]="$ip"\n);
-      print SCRIPT qq(MX_IP_ADDRESSPREFIX[$i]="20"\n);
+      print SCRIPT qq(MX_IP_ADDRESSPREFIX[$i]="$H->{$ip}->{addressprefix}"\n);
       print SCRIPT qq(MX_IP_BROADCAST[$i]="141.14.31.255"\n);
       print SCRIPT qq(MX_IP_DEVICE[$i]="$H->{$ip}->{device}"\n);
       $i++;