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Comcast and Verizon both do this. Verizon's been pointing to YellowPages website with a frame above notifying the user that the domain does not exist.

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Comcast hosts anycast DNS servers that opt out of the "domain helper" feature (and support DNSSEC):

75.75.75.75 and 75.75.76.76

http://dns.comcast.net/dns-ip-addresses2.php

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