There are good sources of information out there, but I would shy away from 'wikipedia'. I would lean towards Jane's Fighting Ships for this type of data...the book is expensive ( roughly $1000 ), but it's a good source that is constantly updated.
A much more affordable resource is Combat Fleet of the World and Guide to World Naval Weapon Systems from the USNI although it only comes out every 5+ years. Worth becoming a member just for the discount on that alone.
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