We check this website, now h1z1.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is h1z1 Down Right Now? - NO! h1z1 is up!
If you have problem with access to site h1z1, and domain h1z1.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).