Why is DownOrNot and JustPing reporting that my website is down?

I was pinging my site with DownOrNot and it is reporting that my website is down from all locations.

Then I pinged it with JustPing and it is reporting that my website is also down from all locations.

However, http://qweop.com definitely works fine for me. I tried visiting the site through a couple of other proxies and all of them are finding http://qweop.com online.

What's causing the issue here?

Why is DownOrNot and JustPing reporting that my website is down?

_{Update: Note: this is a test site. I no longer own qweop.com.}

as per uSlackr.

It appears that currently both of your name servers are not answering..

qweop.com.      172800  IN  NS  ns01.000webhost.com.
qweop.com.      172800  IN  NS  ns02.000webhost.com.
;; Received 108 bytes from 192.42.93.30#53(g.gtld-servers.net) in 83 ms

;; connection timed out; no servers could be reached`

It probably works for you, since the DNS cache you are using has the answers and doesn't have to go back to the root for answers.

The "How Do we know" page for DownorNot implies there is a DNS issue. The status for Just ping also says it cannot resolve the hostname. I am unable to resolve the hostname. How is your DNS handled?

Your firewall is probably blocking ICMP traffic which is not allowing the ping to go through.