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I'm not sure if this is the right place, but perhaps it would be good to get some exposure for this as I'm quite surprised to see Rackspace messing this up.
I'm using Chrome with the Chromebleed plugin and it warned me that *edited* has the heartbleed vulnerability (CVE-2014-0160). I could confirm this on https://filippo.io/Heartbleed/. Doing a Whois on the webserver's IP address (*edited*) I found it was apparently Rackspace who manages to run servers not patched for this vulnerability in 2016.
I couldn't find a regular abuse address on the Whois so that's why I decided to put it here.