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