Sub domains are typically used when the domain needs to point to a different website from the main domain, whether this is to the same website or just a different page. Sub domains are something that you set up on an existing domain so you don't need to register them as such.
A sub domain would look something along the lines of: business.yourdomain.com. You can use any word that you would like before your domain name.
There are two parts in setting up a new sub domain.
Creating the sub domain in your domain name control settings to point to Rocketspark
To do this you can contact your domain provider and they will be able to help you set up a sub domain.
Once a sub domain has been created you need to know where to point it. This is done using an A record, the DNS settings for Rocketspark websites can be found here. Select the correct country where your website is and use the relevant domain information to create an A record.
Or if your domain is with Rocketspark, follow the next section below.
Step 2. Assign the sub domain to a website
Let us know which website you would like you sub domain to point at. If you would like to point the domain towards a page on your current website please tell us which page you would like and we would set the page up on your website with a shorter URL e.g yourdomain.com/business
Adding sub domains to a domain in your Rocketspark account.
Follow the our custom DNS guide, to learn how to add either a CNAME or A record.
It all depends on the destination, if the destination you have been given is an IP address, e.g. 126.96.36.199 then you must setup an A record. If the destination is a host name like portal.rocketspark.com then the sub domain must be setup as a CNAME.