Sorry to disagree, but...
For all:
Forgive me for being pedantic, but in fact there really is a difference. An em-dash would probably never be correct in a domain name since it separates thoughts in a sentence. An en-dash might be possible in an unusual title. It is the equivalent of the word "through" as in 1900–1925. The hyphen is used to join words, as is commonly done in domain names. A hyphen is shortest, an en-dash is longer, and an em-dash is longest.
Blame Lajocar for this. If the question had been worded as intended the first time we would all have been spared this ranting!
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