How to access SwaggerHub UI without domain setup

I am trying to do some POC installation and migration of swaggerHub2.0 but getting some problem. During the installation, it is require to have some ready DNS name for the swaggerHub which is using in the configuration to finish up the installation. So the question is, is it possible to access the UI without any DNS name for the swaggerHub and also without any Mail server? I love to know if there any port forwarding thing there so that i can access the swaggerHub UI without any need of DNS at least.