You must activate a valid license on the BIG-IP® system before you can use it. To activate a license for the system, you must have a base registration key. The base registration key is a 27-character string that informs the license server about which F5® products you are entitled to license. The base registration key is preinstalled on your system. If you do not already have a base registration key, you can obtain one from F5 Technical Support (http://support.f5.com/).
If the system is not yet licensed, the Configuration utility prompts you to enter the base registration key. Certain systems might require you to enter keys for additional modules in the Add-On Registration Key List field.