[tsaixingwei]

This would be great for testing multi-tenanted cloud applications. For example:

tenant1.10.0.0.1.xip.com tenant2.10.0.0.1.xip.com tenant3.10.0.0.1.xip.com

They all resolve to the same IP Address (10.0.0.1), but now the web application at that address knows which tenancy is being targeted.

[recurser]

You can do this with pow if you're testing locally - tenant1.mydomain.dev, tenant2.mydomain.dev etc, and the URLs are a bit cleaner.