Dell servers come with a service tag (basically a serial number consisting of 7 figures and letters). If you enter this at Dell website you get a comprehensive list of installed hardware. This includes the DRAC. From there you can read the manual and see if it comes with the dedicated interface.
This assumes that you can not simply look at the server. Mine (A dell R300) came with 3 ethernet ports, one marked DRAC.
As for a separate IP: The DRAC is basically a mini computer on a plugin card. So yes, you would need a different IP for it. I think most people even connect it to a different (management) network. Either physically separated, or via VLANs. The last thing you want is to expose this interface to the public. Esp. if you do not change the default password (which is 'calvin')