XF 2.2 If possible to know that what xenforo version using this site using

If you have access to the ACP.. you can find out... otherwise.. it's going to be hit/miss.

Generally..it's a pretty good idea to protect the ACP from outside access, and that's where you can find the info out at.
 
A better question is why it would matter. If the plan is to try to make a copy-cat site, and being on all the same versions/themes/plugins, it's unlikely to be successful.
 
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