I just noticed while browsing around on the Xbox sites that they now all seem to be IPv6 enabled. Some of the addresses:
live.gtm.xbox.com. 30 IN CNAME live-origin.gtm.xbox.com.
live-origin.gtm.xbox.com. 30 IN AAAA 2a01:111:f009::ace
marketplace.xbox.com. 300 IN CNAME marketplace.gtm.xbox.com.
marketplace.gtm.xbox.com. 30 IN CNAME marketplace-origin.gtm.xbox.com.
marketplace-origin.gtm.xbox.com. 30 IN AAAA 2a01:111:f009::fab:fab
Hehe. "ace" and "fab fab".
The xbox.com stuff flips around a lot, sometimes pointing to edgesuite, sometimes to akamai, etc. All are using IPv6 though:
www.xbox.com. 66 IN CNAME www.gtm.xbox.com.
www.gtm.xbox.com. 30 IN CNAME msxbwsd.vo.llnwd.net.
msxbwsd.vo.llnwd.net. 116 IN AAAA 2607:f4e8:110:104:225:90ff:fe09:66e2
msxbwsd.vo.llnwd.net. 116 IN AAAA 2607:f4e8:110:104:230:48ff:fe89:8c3e
www.xbox.com. 141 IN CNAME www.gtm.xbox.com.
www.gtm.xbox.com. 14 IN CNAME www.xbox.com.edgesuite.net.
www.xbox.com.edgesuite.net. 285 IN CNAME a1123.dsw2.akamai.net.
a1123.dsw2.akamai.net. 5 IN AAAA 2001:418:1c01::8cae:183a
a1123.dsw2.akamai.net. 5 IN AAAA 2001:418:1c01::8cae:1851