Zonefile example

On this page we give an example of a basic zone file and it’s contents.

We recommend using the nsd-checkzone tool to verify that you have a working zone.

Creating a zone

A zone needs a SOA (Source Of Authority) record. For the exact structure we refer you to the wiki page. Note that all records must Fully Qualified Domain Names (FQDNs) which adds a . to the domain name. In this example the FQDN is: example.com.. This is in contrast to relative domain names, where the origin gets appended (so in the example below, www gets expanded to www.example.com.).

Also note that @ symbol in the zone file refers to the $ORIGIN parameter. To have multi-line resource records opening and closing brackets can be used to ignore linebreaks. Finally, if a name at the start of a record is missed, the name from the previous entry gets used (This is why all three A records are equivalent).

$ORIGIN example.com. ; 'default' domain as FQDN for this zone
$TTL 86400 ; default time-to-live for this zone

example.com.   IN  SOA     ns.example.com. noc.dns.icann.org. (
        2020080302  ;Serial
        7200        ;Refresh
        3600        ;Retry
        1209600     ;Expire
        3600        ;Negative response caching TTL
)

; The nameserver that are authoritative for this zone.
                                NS      example.com.

; these A records below are equivalent
example.com.    A       192.0.2.1
@                               A       192.0.2.1
                                A       192.0.2.1

@                               AAAA 2001:db8::3

; A CNAME redirect from www.exmaple.com to example.com
www                             CNAME   example.com.

mail                    MX      10      example.com.

1.2.0.192.in-addr.arpa". PTR example.com.