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Re:Securing access to Wikimedia sites with HTTPS by default by schoen on Friday June 12, 2015 @01:13PM (#9707220)
Nope, it's a wildcard cert -- if you view the cert contents you see that the subject includes

CN = *.wikipedia.org

Re:Securing access to Wikimedia sites with HTTPS by default by _joe on Friday June 12, 2015 @03:40PM (#9708096)
Actually, it's a bit more complicated than that. We don't just serve .wikipedia.org from our frontends, but also e.g. .wikisource.org etc.

So yes, we are using SNI but for wildcart certs :)