Firstly, for those who need to know, a ‘sub-domain’ is simply a separate, individual web folder, which can be attached to a ‘main’ domain and treated in all respects as a separate entity online. It is similar to a ‘sub-web’, which most hosting facilities include except that it is, in it’s own right, treated as a separate domain by SEs rather than a sub-folder under a domain.

The way in which they are represented online as URLs is as follows:

For instance, if you have a domain name, ‘domain.com’ and you add a sub-domain named ‘bubble’, URL to that particular ‘website’ (which is what each sub-domain amounts to, a separate website) will be ‘bubble.domain.com’. No doubt, many have seen these types of URLs online and in promo emails etc. The ‘dot’ between sub-domain and main domain is not to be confused with ‘dash’ that can be used as part of a main domain. For instance, ‘bubble-domain.com’ would need to be registered and propagated in it’s own right whereas, sub-domains can be created under a main domain in a matter of seconds, with their own FTP password, image, private and cgi-bin folders etc.

There are several things which you ought to know about your domain name registration. While you pay for annual renewal of registration, and especially if you have “locked” your domain name, it is yours. However, when you don’t renew name with your registrar, it goes through a protection scheme of up to 75 days when you can renew registration and add domain name back into your portfolio. After that, it’s open hunting season for expired domain names, particularly those with web traffic.