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I don't know about any website, but the answer to your question is easy.

If you have an iPhone 5, it came running iOS 6.0. It is not capable of running an earlier version.

If you have any other iPhone, it was released before iOS 6.0.
 
Is there a problem? I just want to know because I want to be able to show that mymiphone was made early and I got it on launch day!

If its to much to ask then never mind then!
 
If the iPhone was purchased at an Apple store at any time during the initial Launch date September 21st, 2012. ALL iPhones were shipped with IOS 6.0. If your iPhone was purchased at an Apple store at any time after November 1st, iPhones shipped would be under IOS 6.0.1 or IOS 6. IOS 6.0.1 was released on November 1st, 2012. IOS 6.0.2 was released December 18th, 2012.
 
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