According to
this article Inktomi indicates that for the most part search engines index by the URL not the IP (although they did mention that it may vary by search engine).
When I write to Inkotomi support desk, about this sharing ips check the answer that they gave to me:
My question:
Are search engines index only one site from one IP address (one DOMAIN (not URL) per one IP address) even though I submit both of them regularly?
Inkotomi support service:
When submitting sites, search engines only take into account the URL that is being submitted. Not the IP it came from. If the pages are different then there will not be a problem.
Virtual domains are very common on the internet, so if what is mentioned was true in all cases, search engines basically would not be effective in finding anything.
The problem mentioned is most likely not all that common, especially when priority submission are used due to the frequent refresh of details.
My question:
If 10 sites are hosted on one IP. If one site was banned because of spamming or someother thing. This banning is based on IP or domain name? If it is based on ip then all other sites are affected in search engine positioning?
Inkotomi support service:
Most engines will only ban the name(URL) and not the IP, although some may ban the IP as well. It is pretty much up to the individual engines how they do this.
If you suspect an IP has been banned you should contact the engine in question and sort it out with them.
If this information is accurate, then it shouldn't be an issue to host multiple sites on one IP. Considering the amount of shared hosting that is out there, I'd have to be inclined to believe this is the case.
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