yes it'll affect the sites too that are using whitehat. that is why private blog networks use different class ips.

It was a network. It has nothing to do with IP sharing. You are confusing the two. As I mentioned earlier, I have several domains that have been completely de-indexed by Google for some serious black-hat stuff that share the same IP with some of my very best sites.

Now, if you build a blog network on the same IP, then you are providing Google with a footprint to take down the whole network. However, that is not what the OP is referring to. That is something altogether different.

For the benefit of anyone who reads this thread moving forward:

The BMR debacle, although possibly aided by the fact that they may have (not sure if they even did) used shared IPs, does not mean a good site will be penalized because a bad site shares the same IP.

Shared hosting providers put thousands of unrelated websites on shared IPs all the time. Following the logic that a bad site can get a good site penalized would mean that Webmaster A could get Webmasters B though Z all penalized because they share IPs.

Short Answer:

No, a bad site cannot get a good site penalized simply because it shares the same IP. Now, if you go and start interlinking the bad sites and good sites, you can run into problems (ie. BMR).

I have something to share about this. We all have different experience when it comes to ranking our keywords and here's mine. Simple and basic I would say. I have more than 50 domain names and 3 Ips scattered to 1 VPS, 1 dedicated and I reseller hosting. Did my sites got penalized ? No. Panda and penguin did not hit me that bad. I' m still there within top 5, #2 at the highest with some nice keywords. Here's a thing I don't build backlinks from other websites that are not mine except of course if they link to my sites and only hubpages. I know its unusually SEO technique but thats been my strategy since few years back. I'm lazy to do backlinking from other sites. Although my next batches of domain names I will be getting another vps just to spread it more. So far I'm seeing the good results without really thinking about future google algo updates.

Before I forget it I have like 13 exact domain match within the same niche and same IP and I did a link wheel among those domain names and the last for two years all I can say Google PR is increasing and more and more related keywords ranks.

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The primary difference between white-hat and black-hat is fairly easy to define:

Black-hat: generally any method that is in opposition to Google's webmaster guidelines

White-hat: strategies that typically follow Google's best practices and Webmaster Guidelines

Those are some clear answers.

But I got some more questions then:

1) If this doesn't apply to ip-address, does it apply to a particular person? So, if you are the owner of a blackhat website and you are also a owner of a whitehat website. Does the blackhat website effect the whitehat website badly?

2) If you own an ip-address were only your own websites are on it (for example a dedicated server) then a whitehat SEO website can be effected badly by blackhat website on the same ip right?

3) I heard that the Google Penguin update looked at over-optimalization of exact domain keyword matching. If you are the owner of hundreds of exact domain keyword matching websites and you are also the owner of big quality content whitehat SEO website, does the exact domain keyword matching sites hurt your quality content whitehat SEO website? If so, how many is too many?

I know there are not exact answer to these above questions but I want to know your opinion and your argumentation.