OpenDNS name servers

"Those are open DNS servers - i.e. they're on the public internet. They belong to Level 3 so are probably safe to use.

OpenDNS (note no space) is another DNS provider which has different addresses for it's public servers, which are in harrymc's post."

"They have nothing to do with OpenDNS (see Dave Webb's post) and, since they are open recursive name servers, they should not be trusted:

risk of being shut down at every moment, because they can be used for amplification attacks (see RFC 5358)
much higher risk of poisoning through the Kaminsky weakness (since a prerequisite of the Kaminsky attack is the ability to use the name server)."