How to create Reverse Zone File Demo | Domain Name System | Mastering BIND DNS Server

Create reverse zone file in DNS demo.

In Domain Name System (DNS), a reverse zone file is a file that maps IP addresses to domain names. It is used to translate IP addresses (such as 172.24.0.1) into the corresponding domain names (such as example.com) that can be used to identify a specific host on the Internet.

The reverse zone file is organized differently from the forward zone file. Instead of using the domain name as the left-hand side of the record, it uses the reversed IP address in the in-addr.arpa domain. The reversed IP address is the IP address with the octets in reverse order, followed by the ".in-addr.arpa" domain name.

For example, if the IP address is 172.24.0.1, the reversed IP address is 1.0.24.172. Therefore, the reverse zone file for this IP address would be located in the "0.24.172.in-addr.arpa" domain.

The reverse zone file typically contains resource records (RRs) that specify the following information:

The reversed IP address being resolved (the left-hand side of the record)
The type of the record (e.g., PTR)
The domain name associated with the IP address (the right-hand side of the record)
For example, the following record in a reverse zone file maps the IP address 172.24.0.1 to the domain name example.com:

1 IN PTR master.example.com.

In this example:

1.0.24.172.in-addr.arpa. is the reversed IP address being resolved.
IN is the class of the record (usually IN for Internet).
PTR is the type of the record (a pointer record).
master.example.com. is the fully qualified domain name associated with the IP address.
Overall, the reverse zone file is used in DNS to map IP addresses to domain names, and it plays a crucial role in identifying specific hosts on the Internet.

$TTL 1D: this time to live directive specifies for how much time zone data will be kept in cache by the resolvers. It can be specified at the top of zone files.

“;” represents comments

the syntax of resource records(RR) is
domain ttl class type rdata

domain: current domain or some specific domain. “@” represents originating domain. in this case “example.com”.

ttl: for how long the record will be cached. if nothing is specified, it will take the value from “$TTL” directive specified in the beginning.

class: record classification mostly “IN”. if left empty, “IN” is assumed.

type: type of record such as “SOA”, “A”, “PTR”, “CNAME”, “NS”, “MX” etc.

rdata: particular record data
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