This article applies to 123-reg Domain names
Subdomains are subsections of a domain name that can be used for a multitude of reasons; for example, you could use it to link to the online shop section of your website, using something like store.mydomain.com, or to section different language areas of your site, such as en.mydomain.com and fr.mydomain.com. Subdomains can be configured to web forward and email forward.
Please Note: It is not possible to modify the DNS of a subdomain through this function.
To modify the settings of your subdomain, click on the Subdomains option in the Domain names section, ensure that the subdomain you wish to make changes to is in the drop down box and click on the modify subdomain button.
Please Note: You will need to have purchased a subdomain to be able to manage it.