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Re:4.2.2.2: The story behind a DNS legend by metachris on Wednesday April 21, 2010 @02:16PM (#1282900)
With OpenDNS you can enable or disable NXDOMAIN: http://www.opendns.com/support/article/312
Re:4.2.2.2: The story behind a DNS legend by fragmede on Wednesday April 21, 2010 @03:12PM (#1283052)
but only for a static ip. If you use OpenDNS on your laptop, and go use coffee shop wifi, unless someone else has disabled NXDOMAIN from that IP, you will get their NXDOMAIN landing/redirect page instead.

Which limits its usefulness to desktop systems on a static IP.