Ask YC: Online demo url

We just read that YC prefers an obscure demo url that is not password protected, and we have the following options.

http://56.34.433.32

- url to our development server

- This is safe without a password protection, but it is less reliable and I have to keep my computer on until YC reviews our demo.

http://www.demo.com/obscure, or http://www.obscure.com

- url to our production server

- Although direct hits aren't likely, without a password protection, we are concerned that they will become accessible from search engines.

How did you guys handle this problem, and what would be the most appropriate form of the obscure demo url?

Thank you very much, and good luck to you all!