![]() In the /24 network, you have 255 unique IP addresses. In our example we will use an IPv4 /24 network. The reverse DNS zone depends on the size of your IP network. In order to create a PTR record, at first need to be created a Reverse DNS zone ( read more about the reverse dns zones here). The proper Reverse DNS configuration is always a good idea to avoid any potential email filtrations. This has become standard so to say as all mail providers try to keep the spam out of their clients' Inbox. The PTR records are a must-have for outgoing mail servers because most of the mail providers reject or mark as spam messages received by mail servers without valid reverse DNS configuration (missing PTR or mismatch A record for the hostname). PTR records provide trust that the given hostname or a domain are connected to the IP address. ![]() The PTR Record resolves the IP address to a domain/hostname. In the Reverse DNS zone, you need to use a PTR Record. While in the domain DNS zone the hostname is pointed to an IP address, using the reverse zone allows to point an IP address to a hostname. The usage of a reverse DNS setup for a mail server is a good solution. ![]() An A record should exist for every PTR record. Using the IP address you can get the associated domain/hostname. PTR records (or Pointer records) are used for the Reverse DNS (Domain Name System) lookup. ![]()
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May 2023
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