How To Update The "A" Record For Subdomains
Before we proceed into the actual updating of "A" records for your domain, first let us understand what "A" records are.
In a nutshell, an A record (Address Record) points a domain or subdomain to an IP address.
The A record is just one type of DNS records which are used to control the location of a resource on the Internet. It is the type of DNS record that is used to point a domain name to an IP address. For example: It is the A record in my DNS settings that points my domain nimrodflores.com to the IP address of my hosting provider, which is 188.8.131.52
Now back to the question, how do we update these A records if we need to? The exact steps differ depending on what hosting control panel your provider uses, or on which registrar your domain is registered.
In this tutorial, I will cover cPanel (which is very popular), Godaddy, and Nameheap platforms. Further, the instructions that follow assume that you have already configured the nameserver for your domain properly. The settings you make by following the instructions on the next pages will only apply if you do it on the server that you assigned as the nameserver for your domain.
If this doesn't make sense to you, please read about setting the nameserver for your domain first:
If you are using the same provider for both your domain and hosting, there is usually nothing more to worry about the nameservers.