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Does google limit the amount of pages it indexes or visits to one IP address?
Nope. I've got lots of domains on 1 IP address and Google has indexed quite a few pages from all of the sites.
Google may consider some pages very similar and therefore not consider them in the SERPs, but not because they are on the same Virtual Host or IP.
I do not remember any official answer from google or GG on this however, just speculation.
Eventually rehosted the other 2 domains seperately within 2 weeks they were all over Google!