Are they all the same theme? Meaning do they all promote the same type of product?
If so, that is a big no-no. Here are a couple of facts provided by .
Google :
* Near-Duplicate Content Filter = If multiple search results contain identical titles and snippets, then only one of the documents is returned.
* Host Crowding = If multiple results come from the same Web host, then only the first two are returned.
The host crowding penalty is why we came up with the idea of providing multiple Class C IP's. It isn't enough to just have them on individual IP's but different C's as well.
This is not to say that you can not share IP's or C's, just don't have them be of similar theme (and that does not refer to design).