Check if your ISP is intercepting DNS queries
It's somewhat common ISPs to intercept DNS queries at port 53 and resolve them at their own.
To check if your ISP is intercepting your DNS queries just type this command in the terminal.
"#.abc" it's an OK answer.
But if you get something like "I am not an OpenDNS resolver.", yep, you are beign cheated by your ISP.