$ORIGIN example.com. ; designates the start of this zone file in the namespace

$TTL 3600 ; default expiration time (in seconds) of all RRs without their own TTL value

example.com. IN SOA ns.example.com. username.example.com. ( 2020091025 7200 3600 1209600 3600 )

example.com. IN NS ns ; ns.example.com is a nameserver for example.com

example.com. IN NS ns.somewhere.example. ; ns.somewhere.example is a backup nameserver for example.com

example.com. IN MX 10 mail.example.com. ; mail.example.com is the mailserver for example.com

@ IN MX 20 mail2.example.com. ; equivalent to above line, "@" represents zone origin

@ IN MX 50 mail3 ; equivalent to above line, but using a relative host name

example.com. IN A 192.0.2.1 ; IPv4 address for example.com

IN AAAA 2001:db8:10::1 ; IPv6 address for example.com

ns IN A 192.0.2.2 ; IPv4 address for ns.example.com

IN AAAA 2001:db8:10::2 ; IPv6 address for ns.example.com

www IN CNAME example.com. ; www.example.com is an alias for example.com

wwwtest IN CNAME www ; wwwtest.example.com is another alias for www.example.com

mail IN A 192.0.2.3 ; IPv4 address for mail.example.com

mail2 IN A 192.0.2.4 ; IPv4 address for mail2.example.com

mail3 IN A 192.0.2.5 ; IPv4 address for mail3.example.com