Are you sure that it was Dyn that was down, or if there was a break somewhere in the nameserver chain? I know that the digs I was running periodically were get

Are you sure that it was Dyn that was down, or if there was a break somewhere in the nameserver chain? I know that the digs I was running periodically were getting SERVFAIL responses from Google DNS even though my local nameservers were actually succeeding.