Indexed in Yahoo by Domain Name and IP Address

Dup Penalty Waiting to Happen?

[andrea99]

I recently noticed that my Yahoo referrals dropped almost to zero. Checking site:mydomain.com shows that virtually all my pages are in the index, but I recently noticed my IP number used as referrer and checked site:00.000.0.000 and found that 169 of my pages are in the index that way.

The same IP# search on Google returns "...did not match any documents." Though most are in G at the domain name and G referrals are now quite good. :)

Is Yahoo penalizing dup content for being in the index as IP number and what can be done about this?