I guess it depends on which data center you query – According to a SEO forum post I read recently there over 500 and they listed all the IPs.
You can check 72 at once. I see CAP at 5 now according to the page rank checker below. My new site reads 2 at some data centers and still 0 at others. Perhaps the update is not completely finished? My retail site was always 3 bounced to 2 but now is back to 3.
I usually make SEO page adjustments from the Google Webmaster tools query stats. I can see what was searched on and where that page appeared in the Serps.