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10.5.5 A (Address) Record
The A (Address) Record, lists the addresses for a given machine. The name field is the machine's name and the address is the
network address. There should be one A record for each address on the machine.
; BIND version named 4.9.5-Rel+-Monday-11-November-96
; BIND version GregSchueman-LarryKahn-VirajBais
; zone ' rdmg.mgcs.mei.co.jp' last serial 720
; from 133.185.245.7 at Sun Sep 12 19:11:35 1999
$ORIGIN mgcs.mei.co.jp.
rdmg
$ORIGIN rdmg.mgcs.mei.co.jp.
ifax-gz03
qmc-cco1
ifaxos01
ifpdyna
A Record (Bind 4.9.5 for NT) in "db zone.info" file
10.5.6 PTR (Pointer) Record
Pointer records are the reverse-lookup file entries that enable IP addresses to be resolved to host names. DNS is used to resolve
host names to IP addresses, so the opposite process is callled reverse lookup. They specify the IP address in reverse order (like a
DNS name, with the most specific information first) and then corresponding host name. The files are named according to the class
of network, but with the octets in reverse order. The syntax for a PTR record is shown below:
<ip reverse domain name> IN PTR <host name>
10.5.7 CNAME (Canonical Name) Record
The CNAME (or canonical name) record is an alias (nickname), enabling you to specify more than one name for each IP address.
The syntax of a CNAME is shown below:
<alias name> CNAME <host name>
Using CNAME records, you can combine an FTP and a Web server on the same host. Nicknames are useful when a well-known
host changes its name. In this case, its usually a good idea to have a CNAME record so people still using the old name, will get to
the right place.
10.5.8 NS (Name Server) Record
The Name Server record specifies the other name servers for a domain. The syntax for a name server record is shown below:
<domain> IN NS <nameserver host>
An example of a name server record follows below:
@ IN NS nwmgr.mgcs.mei.co.jp
The "@" symbol indicates the local domain. The server "nwmgr" in the domain "mgcs.mei.co.jp" is the name server.
IN
SOA
nwmgr.mgcs.mei.co.jp. postmaster.rdmg.mgcs.mei.co.jp. (
721 10800 3600 604800 86400 )
IN
NS
nwmgr.mgcs.mei.co.jp.
IN
MX
10 mlsv2.rdmg.mgcs.mei.co.jp.
IN
A
172.21.94.216
IN
A
133.185.254.212
IN
A
172.21.97.26
IN
A
202.244.202.29
IN NS
nwr42.rdmg.mgcs.mei.co.jp.
1
IN PTR
localhost.rdmg.mgcs.mei.co.jp.
;
PTR record (Bind 4.9.5 for NT) in "db.127.0.0" file.
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