Release Found: Red Hat Enterprise Linux 5
The subscription number (sometimes referred to as an installation number or a registration number) for a Red Enterprise Linux 5 subscription can be found in several places, depending on how the subscription was purchased.
For purchases made directly from Red Hat or from a reseller:
visit the Customer Center (you will need to login, see What is my Red Hat login? How do I get an RHN Login and why do I need one? for help with your login ID).
Or, contact Red Hat Customer Service: http://www.redhat.com/about/contact/directory.html#custservice
For purchases made from Dell:
First, activate the service tag: https://www.redhat.com/wapps/activate/protected/dell.html.
The subscription number can then be found in the Customer Center (you will need to login, see What is my Red Hat login? How do I get an RHN Login and why do I need one? for help with your login ID).
For purchases from a hardware vendor that included a media kit, refer to the front of the poster included with the media kit.
For more information on Subscription Numbers, see the FAQ.