$TTL 300 ; example.org @ IN SOA ns1.example.org. postmaster.example.org. ( 2018111111 ; Serial 28800 ; Refresh 1800 ; Retry 604800 ; Expire - 1 week 86400 ) ; Negative Cache TTL IN NS ns1 ns1 IN A 192.5.0.10 server1 IN A 192.5.0.20 server2 IN A 192.5.0.30 xp1 IN A 192.5.0.40 xp2 IN A 192.5.0.50 xp3 IN A 192.5.0.60 one IN CNAME xp1 two IN CNAME xp2 _xmpp-server._tcp.one IN SRV 5 1 52269 xp1 _xmpp-server._tcp.two IN SRV 5 1 52269 xp2 scansion.one IN CNAME xp3 scansion.two IN CNAME xp3