serve a localhost from a different port in EmberJS

Normally, when a user calls

ember serve

The local host is always 4200 by default. It would be nice if I could specify a different port so that I could have two ember web apps running. Is it possible to have a ember serve a different port?

The reason I care is that I'm using one of my web apps to help me build the other, and it would be convenient to have them both running at the same time so that I don't keep going back and forth with my builds.