RDP to a few computers at home

Hi everyone,

I have 3 computers at home and sometimes, I need to RDP into them when I am not at home. I know that i can forward 3389 to a specific host. But that only limits to one host. But I have 3 computers, is there a way to configure so that I can remote into all 3 computers instead? I don't know if there are other ports for RDP besides 3389. (assuming I can't use 3rd party software like teamviewer and logmein). Thanks.