168.220.115.66.bigleaf.net has no CNAME records.
Question and response
Question
dig 168.220.115.66.bigleaf.net. NS
Answer
The response has no answer records.
Authority
bigleaf.net. 600 SOA bigleaf.net. admin.bigleaf.net. 1771372800 3600 120 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0