You install or upgrade vCenter Server, like any other network server, on a virtual machine or physical server with a fixed IP address and well-known DNS name, so that clients can reliably access the service.

If you plan to use a FQDN, for the virtual machine or physical server on which you install or upgrade vCenter Server, you must verify that the FQDN is resolvable.

At the Windows command prompt, run the nslookup command.

nslookup -nosearch -nodefname your_vCenter_Server_FQDN

If the FQDN is resolvable, the nslookup command returns the IP address and name of the vCenter Server virtual machine or physical server.