hapi is (probably) the only framework that supports adding multiple ports to a single server instance. This was done for two use cases:

• Support an internal process admin channel (serve normal API over port 8000 and allow internal admin access on port 8001)
• Run multiple services in a single process for testing purposes (run a single server that have both your "login" and "billing" APIs, each on a different port)

At this point, external tools would do as good a job at allowing you to manage multiple servers, each with a single port.