v6host.ipv6.unitedlayer.com has no CNAME records.
Question and response
Question
dig v6host.ipv6.unitedlayer.com. NS
Answer
The response has no answer records.
Authority
ipv6.unitedlayer.com. 3507 SOA ns1.unitedlayer.com. ed.unitedlayer.com. 2016080501 21600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0