Originally Posted by
mixture
Not sure about compromised, would need to do a little research.
Impersonation of IP blocks is trivial if you can put the right pieces together, but there are ways and means to minimise the impact.
One of the biggest use of botnets is launching DDoS attacks, and one very popular form of attack is DNS reflection.
So whilst perhaps not compromised as such, I'm sure OpenDNS see and have seen their fair share of DDoS attacks.
Google DNS was the target of a very strange 'attempt' at DoS last week. Users would have seen blank webpages and a strange self-signed SSL cert.