Mike a écrit :
>
> nslookup nslookup http://en.wikipedia.org

Wrong query, try "nslookup en.wikipedia.org" instead.

> gets me
>
> Server: 208.67.222.222
> Address: 208.67.222.222#53

This is the address of resolver1.opendns.com. Looks like your box uses
OpenDNS nameservers. They mangle replies and thus cannot be trust when
doing DNS tests.

> Non-authoritative answer:
> Name: http://en.wikipedia.org
> Address: 67.215.66.132

This is the address of hit-servfail.opendns.com, not en.wikipedia.org.
Instead of replying with the DNS error your query deserved, OpenDNS
replied with the address of their web server handling failed queries.