my %com = qw(
	     a.gtld-servers.net. 192.5.6.30
	     b.gtld-servers.net. 192.33.14.30
	     c.gtld-servers.net. 192.26.92.30
	     d.gtld-servers.net. 192.31.80.30
	     e.gtld-servers.net. 192.12.94.30
	     f.gtld-servers.net. 192.35.51.30
	     g.gtld-servers.net. 192.42.93.30
	     h.gtld-servers.net. 192.54.112.30
	     i.gtld-servers.net. 192.43.172.30
	     j.gtld-servers.net. 192.48.79.30
	     k.gtld-servers.net. 192.52.178.30
	     l.gtld-servers.net. 192.41.162.30
	     m.gtld-servers.net. 192.55.83.30
	    );
my %net = qw(
	     a.gtld-servers.net.  192.5.6.30
	     b.gtld-servers.net.  192.33.14.30
	     c.gtld-servers.net.  192.26.92.30
	     d.gtld-servers.net.  192.31.80.30
	     e.gtld-servers.net.  192.12.94.30
	     f.gtld-servers.net.  192.35.51.30
	     g.gtld-servers.net.  192.42.93.30
	     h.gtld-servers.net.  192.54.112.30
	     i.gtld-servers.net.  192.43.172.30
	     j.gtld-servers.net.  192.48.79.30
	     k.gtld-servers.net.  192.52.178.30
	     l.gtld-servers.net.  192.41.162.30
	     m.gtld-servers.net.  192.55.83.30
	    );
my %biz = qw(
	     a.gtld.biz. 209.173.53.162
	     b.gtld.biz. 209.173.57.162
	     c.gtld.biz. 209.173.60.65
	     d.gtld.biz. 213.86.51.129
	     e.gtld.biz. 209.173.58.65
	     f.gtld.biz. 209.173.58.66
	     g.gtld.biz. 199.7.64.126
	     h.gtld.biz. 199.7.77.126
	    );

# ipv6 only server!!!
#	    j.gtld.biz.
my %us = qw(
	    a.gtld.biz. 209.173.53.162
	    b.gtld.biz. 209.173.57.162
	    c.gtld.biz. 209.173.60.65
	    i.gtld.biz. 156.154.96.126
	    k.gtld.biz. 156.154.72.65
	   );
my %info = qw(
	      a9.info.afilias-nst.info 204.74.112.33
	      b9.info.afilias-nst.info 204.74.113.33
	      c9.info.afilias-nst.info 199.7.66.33
	      d9.info.afilias-nst.info 199.7.67.33
	      e9.info.afilias-nst.info 192.100.59.33
	      f9.info.afilias-nst.info 198.133.199.33
	     );

my %servers;

@servers{values %info, values %us, values %biz, values %net, values %com} = 1;

my $servers = join(" or ", keys %servers);

Net::Pcap::compile($pcap, \$filter, "udp port 53 and (host ($servers))", 0, "255.255.255.0");