It might be a little more complicated than this. Unfortunately, the host ID reporting tool can get confused and actually reports your router rather than the physical host. If you got the license with the router, it could have problems, but it should find it as long as it is connected with a cable.
Other problems can include having a wireless LAN taking priority over the physical LAN. This is fixed in the registry.
Otherwise, there is no restriction what the Host ID begins with.
And to make sure, your license file must be processed through the PTC web site with the appropriate Host ID. Simply editing the license file to show the correct Host ID will not work. The Host ID is used to create a unique license code.
