regex and mongodb.

I need a developer with regex and MongoDB experience. the task is: - to build a script that will randomly guess all the registered domain names on the internet and save them to MongoDB. There are probably more than 2 billion domains on the internet, so the database schema design should be done in such a way that will not consume too much space. Please note that no APIs will allow you to get more than 2 bill ion do main names for free or without limitations, so using APIs or any sort of third-party tools will be a very stupid idea for the task. === My thought is that we could try something like this: 1. a-z with/without 0-9 with/without -_.; 2. + TLD i.e .com, etc,; 3. then crawl the web to see if there's any mention; 4. if there is, we save the domain to the db; Just my design thinking though :) === What's your budget & deadline and how many domains can you get per second?