Available Wildcarded DNS Domains
It turns out that some kind hearted people already set up wildcarded domains for you already. You can use any domain below and/or any subdomain of these and they will always resolve back to 127.0.0.1 (your local machine). Here's the list of ones I know about. Let me know if there are more!
localhost- It will always works. Do you know why? I hope so.
[*.]fuf.me- Managed by @fidian; it will always point to localhost for IPv4 and IPv6
[*.]local.sisteminha.com- Managed by @tinogomes
- See below comments for more domains
Of course, you can setup your own local domain.