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Sections of a db (Zone) file in order:
Default Time Out:
$TTL 176644
Default Root Domain:
@
Start of Authority:
SOA
NameServer:
NS
Mail Exchanger:
MX
Default Origin (Same as @):
$ORIGIN
A - Record (IP to Name):
A
Canonical Name (Name to Name-Alias):
CNAME
Internet Address:
IN
Pointer (Last octet to Name-Reverse DB's Only):
PTR
Full Examples:
db (Zone) file:
$TTL 176644
@ IN SOA dnsclass.com. admin.dnsclass.com. (
200005070301 ; serial
10800 ; refresh every 3 hours
3600 ; 1 hour retry
604800 ; expire in one week
)
IN NS ns1.dnsclass.com.
IN NS ns2.dnsclass.com.
IN MX 5 mail.dnsclass.com.
IN MX 10 mail2.dnsclass.com.
;
$ORIGIN testing.com.
;
@ IN A 10.0.0.1
www IN A 10.0.0.4
pop IN A 10.0.0.3
ftp IN CNAME www
storm IN CNAME www
db (Reverse) File:
@ IN SOA dnsclass.com. admin.dnsclass.com. (
200004020101 ; serial number
10800 ; refresh every 3 hours
3600 ; 1 hour retry
604800 ; expire in one week
86400 ) ; minimum time to live
IN NS ns1.dnsclass.com.
IN NS ns2.dnsclass.com.
;
$ORIGIN 0.0.10.IN-ADDR.ARPA.
;
1 IN PTR dnsclass.com.
2 IN PTR ns1.dnsclass.com.
3 IN PTR ns2.dnsclass.com.
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