Do an “OpenDNS” test. It’s very easy. Here’s how:
1. Set DNS to
2. Open this url http://welcome.opendns.com/
If your ISP allows our DNS service . You will see screenshot like this
Otherwise, you will be notified that you are behind proxy. In this case, you can’t use our service and must use VPN.
Visit our brother site below for the list of best vpn service.