$TTL 1d  ; ttl is 1 day
@		IN	SOA	dns1.example.nl. dns.example.nl. (
				2020050800     ; serial (date & version)
				8h             ; refresh every 8 hours
				20m            ; retry after 20 minutes
				4w             ; expire after 4 weeks
				20m            ; negative caching ttl is 20 minutes
				)

; DNS name servers
		IN	NS	dns1.example.nl.  ; primary name server
		IN	NS	dns2.example.nl.  ; secondary name server

; SMTP mail gateways
		IN	MX	10 mx.example.nl.            ; MX gateway
		IN	MX	100 fallback-mx.example.nl.  ; fallback MX gateway

; hosts
		IN	A	192.0.2.162            ; server
		IN	AAAA	2001:db8:1192::2:162   ; server (IPv6)
www		IN	CNAME	example.nl.            ; WWW server
ftp		IN	CNAME	example.nl.            ; FTP server
mx		IN	A	192.0.2.106            ; mail gateway
mx		IN	AAAA	2001:db8:1192::2:106   ; mail gateway (IPv6)
mail		IN	A	192.0.2.107            ; mail server
mail		IN	AAAA	2001:db8:1192::2:107   ; mail server (IPv6)
imap		IN	A	192.0.2.108            ; IMAP server
imap		IN	AAAA	2001:db8:1192::2:108   ; IMAP server (IPv6)
smtp		IN	A	192.0.2.109            ; SMTP gateway
smtp		IN	AAAA	2001:db8:1192::2:109   ; SMTP gateway (IPv6)

; exterior hosts
dns1		IN	A	192.0.2.5              ; primary name server
dns1		IN	AAAA	2001:db8:1192::2:5     ; primary name server (IPv6)
dns2		IN	A	198.51.100.6           ; secondary name server
dns2		IN	AAAA	2001:db8:2198::16:6    ; secondary name server (IPv6)
fallback-mx	IN	A	198.51.100.106         ; fallback mail gateway
fallback-mx	IN	AAAA	2001:db8:2198::32:106  ; fallback mail gateway (IPv6)