Well, not exactly... What Wikipedia, and in turn the RFCs say is that since the original [RFC 952][1], which didn't allow leading numerics, you can now have them. ( Per [RFC 1123][2] ) You still can't have *all* numeric though, which is your problem. 

Your '6952' isn't a valid hostname, while '6952x' should be fine. But, RFCs aside, I've had problems within the last year or so with leading numerics. I'd avoid them, unless there's a compelling reason not to.


 [1]: http://tools.ietf.org/html/rfc952 "RFC 952"
 [2]: http://tools.ietf.org/html/rfc1123#page-13 "RFC 1123"