[web2py] simulate a sub-domain from localhost?

[Nik Go]

Is it possible to run something like "acme.127.0.0.1:8000"?

I've already set the common_field, and I want to do other local tests. I
tried a different IP address, and it works but I lose access to the admin
interface.

This is my routes.py
routers = dict(
    BASE = dict(
        domains = {
            '127.0.0.1:8000' : 'welcome',
            'acme.127.0.0.1:8000' : 's1'
        }
    ),
)

What's the proper way of doing this?