https://www.peeringdb.com/private/exchange_view.php?id=254 is the correct exchange for the old RMIX.

"CoreSite - Any2 Denver / Formerly RMIX" and 19 members. so a bit small, 17 members not counting the host. but some players with oomph, if they are real as opposed to some mpls hack. and swollowed by the never-heard-of-em any2 marketroids. could be worth david's time, but he's the judge. denver has always been a bit difficult. i once helped run an isp out of littleton. but we only had offices there, packets were all far away. hell to even get fiber there. i hope things have improved. randy