Valid Domain Names

valid domain names

Addon Domain

Add-On <a href=”http://exabytes.com/”>Domain</a>
An add-on domain is a new domain that is added on top of your main domain. It creates a sub directory within your main web hosting directory but can show a different website. The add-on domain collects the information from the sub domain directory using the same space and bandwidth as your main account, however it won’t have its own control panel.

Add-On Domain Benefits

1. Create different content of websites on the same web hosting account.
2. Save money and web space by using one hosting account instead of several hosting accounts.
3. The add-on domain shares all the same resources (disk space, bandwidth…) with your main site.
4. The add-on domain has its own FTP account, site stats, cgi-bin which is created automatically.
5. Upload all pages, images, scripts, forums, etc. to your add-on domain directory.
6. Access your add-on domain using several web site addresses

Example: SiteA.com is Main Domain and SiteB.com is Add-on Domain.

http://www.SiteB.com

http://www.SiteB.SiteA.com

http://www.SiteA.com/SiteB

7. Promote several web sites within one hosting account with their own set of keywords.

In the <a href=”http://exabytes.com/”>Domain</a> Name Server (DNS) hierarchy, a subdomain is a domain that is part of a larger domain name. A DNS hierarchy consists of the root-level domain at the top, underneath which are the top-level domains, followed by second-level domains and finally subdomains.
Valid subdomains as described by RFC 1034 may contain any letter or number as well as the ‘-’ (hyphen), but must begin with an alphabet character. While both upper and lower case characters are valid, subdomains are case insensitive so ‘ABC.com’ is identical to ‘abc.COM’.

Length of sub domain
The length of a particular subdomain label is restricted to 63 characters, but the number of subdomain labels in a domain name is arbitrary.

Structure
Subdomains are separated by dots “.” and are read from left to right, in descending specificity. Each consecutive subdomain contains all previous subdomains, and is contained by any subsequent subdomains. All subdomains are contained by the second-level domain, which is in turn contained by its top level domain.
Example:
subCBA.subBA.subA.domain.tld

In this example the top level domain is ‘tld’ and the second level domain is ‘domain’. Within ‘domain’ the subdomains are contained in a tree structure.

Popular real-life examples would be news.google.com, mail.yahoo.com, support.exabytes.com and en.wikipedia.org, in which news, mail and en are subdomains, respectively.

sourced from http://exabytes.com.my

Domain, domain transfer, addon, subdomain

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