Checking the write in the reverse zoneChecks records in the reverse zone for an IP address.
A reverse DNS lookup – is an appeal to a special domain zone to determine a domain by its IP address using a PTR record (or in the common people «Record in the reverse zone»).
This entry is very often used to improve the quality of email delivery with a return address that belongs to your domain. It allows the recipient to verify that the letter was actually sent from the declared domain.
For example, you are the owner of the example.com domain and want to send email using a script with the return address firstname.lastname@example.org, you also want your email not to end up in spam. To do this, you need to contact the company from which you rent hosting and ask to make an entry in the reverse zone for the example.com domain. This will improve the quality of your email delivery.
To determine the IP address of your site, you can use the Check DNS records service