Server addresses vs http URLs resolving to same URL?

[austtr]

I have several sites that use shared server hosting with the same hosting company. As part of a review to see if these sites need a Google disavow request, I've been testing <a backlink analyzer> and it is capturing inbound links in the format of ns2.hostserver2.net/page-name.htm

Enter that address in a browser and of course it resolves to the correct URL. However, <the backlink analyzer> is also finding ns2.hostserver3.net/page-name.htm and ns2.hostserver4.net/page-name.htm and ns2.hostserver6.net/page-name.htm etc etc … which also all resolve to the correct URL

To say I am confused is putting it mildly and my immediate thought is if a link management tool is reporting multiple addresses all resolving to one URL, is there a likelihood that Google would be seeing the same thing and treating it as duplicate content?

Appreciate any suggestions on what, if any, action is needed.
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[edited by: Robert_Charlton at 8:32 am (utc) on Feb 4, 2014]
[edit reason] per Charter, no specific tool names [/edit]

[rainborick]

I've seen this before, so I'm sure Google has, too. It's unlikely to ever cause you a problem since the nameserver domains aren't going to have the PageRank or other quality signals to ever contest the ownership of the correct domain.

In any case, the "ounce of prevention" is pretty simple - strict canonicalization. Just handle it as you would with the www. vs. non-www. issue by making sure that any HTTP requests to your site(s) that don't use your correct domain name respond with a 301 redirect to the correct domain.