A subdomain is a name space within the .tamu.edu domain that can be requested by colleges, departments, A&M System entities and research organizations.
Most hosts are registered in tamu.edu which results in a "very flat name space." It is desirable to create a larger name space so that unique, desirable names are easier to create. Subdomains can help with this problem. However, it is important that subdomains be created in a controlled manner. Haphazard creation of subdomains will result in a name space that cannot be managed.
Departments can request a subdomain to allow them to create hosts within it. This allows departments to manage resources within their subdomain (department) with appropriate granularity and control. Requests for a subdomain are approved by the department head or a higher-level IT professional.
Several Guidelines are used in the creation of subdomains. These guidelines are intended to ensure that subdomains are created in a controlled manner, and effectively used once they are created.
Subdomains are not hosts, but do contain hosts. yourdepartment.tamu.edu is a subdomain, and will allow for the creation of host names like lab1.yourdepartment.tamu.edu or office106.yourdepartment.tamu.edu.