If you have a WipeCenter installed for licenses controll you need to have an Internet connection for this machine. The clients do not have be connected to the internet.
If you use cloud based licenses all clients needs to be connected to the Internet. Reports can be send to the cloud or cabe save on a USB stick.
If you use the Online WipeCenter all clients needs to be connected to the Internet. Reports will be send to this portal.
Time based licenses:
If you use the Time based licenses you do not have to be connected to the internet.