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19.3.3. Example Zone File

Seen individually, directives and resource records can be difficult to grasp. However, when placed together in a single file, they become easier to understand.
The following example shows a very basic zone file.
$TTL 86400
@		IN	SOA (
			2001062501 ; serial
			21600      ; refresh after 6 hours
			3600       ; retry after 1 hour
			604800     ; expire after 1 week
			86400 )    ; minimum TTL of 1 day
dns1		IN	A
		IN	AAAA	aaaa:bbbb::1
dns2		IN	A
		IN	AAAA	aaaa:bbbb::2
@		IN	MX	10
		IN	MX	20
mail		IN	A
		IN	AAAA	aaaa:bbbb::5
mail2		IN	A
		IN	AAAA	aaaa:bbbb::6
; This sample zone file illustrates sharing the same IP addresses
; for multiple services:
services	IN	A
		IN	AAAA	aaaa:bbbb::10
		IN	A
		IN	AAAA	aaaa:bbbb::11
In this example, standard directives and SOA values are used. The authoritative nameservers are set as and, which have A records that tie them to and, respectively.
The email servers configured with the MX records point to mail and mail2 via A records. Since the mail and mail2 names do not end in a trailing period (.), the $ORIGIN domain is placed after them, expanding them to and Through the related A resource records, their IP addresses can be determined.
Services available at the standard names, such as (WWW), are pointed at the appropriate servers using a CNAME record.
This zone file would be called into service with a zone statement in the named.conf similar to the following:
zone "" IN {
	type master;
	file "";
	allow-update { none; };