$ORIGIN 30.172.in-addr.arpa.
$TTL 86400
@	1D IN SOA	ns1.wLeiden.NET. hostmaster.wLeiden.NET. (
			2004041501	; serial (d. adams)
			3H		; refresh
			15M		; retry
			1W		; expiry
			1D )		; minimum

		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

0.0		PTR	network.wLeiden.NET.