Configuring Reverse DNS (Customer Hub) – Leaseweb Knowledge Base

Expertise level: Easy

A reverse DNS (configured as a PTR record) is the association of a domain name with a given IP address. The standards of reverse DNS/PTR mechanism are described in the following RFCs: RFC1033 and RFC1912 Section 2.1

The best practices for servers is to have a PTR associate with each IP addresse used to send emails. The domain provided in the reverse DNS belongs to the responsible parties and usually have a web site set up with the appropriate contact information for the domain.

**The domain provided in the reverse DNS needs to be a valid A record (domain or sub-domain) that resolve to the server IP address.**

If your server has more than one IP address, please ensure that all IP addresses have a corresponding PTR record (not just the first one). It is also recommended to set up that domain for your SMTP service banner, to keep consistency.

Example of a reverse DNS configuration:

mail1.client_domain.com or server1.client_domain.com

How to verify the PTR record of your iWeb server IP:

You can use the command "host". For example if you IP is ww.xx.yy.zz:

# host ww.xx.yy.zz

zz.yy.xx.ww.in-addr.arpa domain name pointer

servername1.client_domain.com.

You can also use online tools such as:

http://mxtoolbox.com/ReverseLookup.aspx

How to change/configure your iWeb Servers IP addresses PTR records:

Customer Hub

1) Log in to the Customer Hub.

2) Click on the classic server for which you want to manage the Reverse DNS entries.

3) Click on "Reverse DNS".

4) Click on the black icon to the right and enter the domain.

5) Click "Save". to complete the operation. Please allow up to 12 hours for the propagation of DNS records.

NOTE: If you have a hardware firewall you will need to set the rDNS in the network section of your firewall.

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