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>how important is unique IP / nameserver to SE ranking?
if the google algo would consist of 100 things these would be points 96 and 97 if you have a legit site. if you are a spammer then it is much more important because when they will go "manually" after you, you will be fucked.
if you are trying to push your sites with crosslinking "a little bit", what I guess you are planning to do, then yes, it is important. i will not go into details why, though. and let me tell you that you are at risk of going belly up, so better go with DD's advice.
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