Not your website is blocked.
But the IP is blocked.

The problem is that you are using shared hosting.
On the same IP are malicious websites hosted and therefor the IP is blacklisted/blocked.

http://urlquery.net/report.php?id=9120833

If you believe your website (url) should not be blocked, you can make a request by using the form on the avast website.
http://www.avast.com/contact-form.php

EDIT:
From virustotal: The URL scanner will only enqueue for antivirus file scanning those files that are not text or similar formats (HTML, CSV, XML, etc.).

No need/use to make the IP look like xxx.xxx.xxx.xxx
A simple dns lookup will show it is 184.82.176.34