$TTL 1d  ; ttl is 1 day
@		IN	SOA	dns1.example.nl. dns.example.nl. (
				2017101300     ; 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	192.168.129.36        ; server
		IN	AAAA	a022:2f87:1098::2:14  ; server (IPv6)
www		IN	CNAME	example.nl.           ; WWW server
ftp		IN	CNAME	example.nl.           ; FTP server
mx		IN	A	192.168.128.34        ; mail gateway
mx		IN	AAAA	a022:2f87:1098::1:6   ; mail gateway (IPv6)
mail		IN	A	192.168.128.35        ; mail server
mail		IN	AAAA	a022:2f87:1098::1:7   ; mail server (IPv6)

; exterior hosts
dns1		IN	A	172.16.64.5           ; primary name server
dns1		IN	AAAA	2f87:a022:0941::8:5   ; primary name server (IPv6)
dns2		IN	A	172.16.128.6          ; secondary name server
dns2		IN	AAAA	2f87:a022:0941::16:6  ; secondary name server (IPv6)
fallback-mx	IN	A	10.184.172.36         ; fallback mail gateway
fallback-mx	IN	AAAA	0941:20a2:7f34::32:7  ; fallback mail gateway (IPv6)