A bit more info may give us a better idea of hat you are askin for:
Perhaps you are refering to a MAC?
Partner code: Xfinity
The partner code is: Xfinity
If you are looking for a PIN for Norton Virus, it will be on the page after you select the red download button on this page: https://internetsecurity.xfinity.com/products-and-services/norton-security-online/
Please let us know if this helps.
Please see the following thread for suggested answers to your question from the past: