IN NS	ns1.wLeiden.NET.
		IN NS	ns2.wLeiden.NET.
		IN NS	ns3.wLeiden.NET.
		IN NS	ns4.wLeiden.NET.

ns1             IN      A       172.18.8.66    ;tango
ns2             IN      A       172.17.8.68    ;proxy1
ns3		IN	A	172.17.143.4   ;proxy2
ns4		IN	A	172.20.128.98  ;proxy4