diff --git a/scripts/perl/blacklist.pl b/scripts/perl/blacklist.pl
index f434669f36..92fa55efe2 100755
--- a/scripts/perl/blacklist.pl
+++ b/scripts/perl/blacklist.pl
@@ -17,13 +17,15 @@ my @netblocks = split(/\n/, get("http://www.infiltrated.net/voipabuse/netblocks.
 
 print "<list name=\"voip-abuse-addresses\" default=\"deny\">\n";
 foreach $addr (@addresses) {
-  print "  <node type=\"allow\" cidr=\"$addr/32\"/>\n";
+    next unless $addr =~ m/\d+\.\d+\.\d+\.\d+/;
+    print "  <node type=\"allow\" cidr=\"$addr/32\"/>\n";
 }
 print "</list>\n";
 
 
 print "<list name=\"voip-abuse-netblocks\" default=\"deny\">\n";
 foreach $netb (@netblocks) {
-  print "  <node type=\"allow\" cidr=\"$netb\"/>\n";
+    next unless $netb =~ m/\d+\.\d+\.\d+\.\d+/;
+    print "  <node type=\"allow\" cidr=\"$netb\"/>\n";
 }
 print "</list>\n";