Apache - Running a Website on a !80 Port

I've set multiple Websites on my Apache server via Webmin + VirtualHosts.

It works like a charm, but is there a way to use different Top Level Domains for the different ports?

I own the server so i could configure nearly everything (besides router configuration i think)

My example would be:

127.0.0.1:80 -> example1.com
127.0.0.1:81 -> example2.com

And so on.