$ORIGIN 28.172.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.