Originally Posted by baddog

If you have IPs

123.456.789.10
123.456.789.11
123.456.789.12
123.456.789.13

and the sites are of similar theme, you are going to get penalized, even though they are on different IPs.

If you have IPs

123.456.786.10
123.456.787.10
123.456.788.10
123.456.789.10

Will keep you from getting penalized.

Of course, if the Class A and/or B is different you will have no problem either.