Oh well, that means there is upstream caching by intermediaries.
Can you ping the site? The IP should be 213.165.231.87. nslookup should return 'vps96824.inmotionhosting.com'. Then do a tracert to see what the end point is. It should be nikongear.* (.net/.com/.org; all are equivalent as the root domain, but only .net will work as the forum foundation).
As a last resort, update your HOSTS file with the following entry
213.165.231.87 nikongear.net
www.nikongear.netNotepad or similar editor can be used. This file is usually found at c:\windows\system32\drivers\etc and you need to run the update in a command window with administrative privilege. If there is no HOSTS file you must create it, but do note it should not have any file extension, just 'HOSTS'.