That the DNS you are using didn't have the site to resolve.
Did you try other DNS?
Did you check with NSLOOKUP?
Sometimes it's a DNS that didn't update right but easy to work around. See my questions.
I buy a domain and I hosted it on blogger meanwhile all are good. but suddenly today my website is showing like your DNS address could not find, but some of other websites are also showing same in my computer. is it fault in my computer or in my website? but my website is showing on my phone, what should I do.