cust-217-150-213.as33932.net has no CNAME records.
Question and response
Question
dig cust-217-150-213.as33932.net. NS
Answer
The response has no answer records.
Authority
as33932.net. 263 SOA ns1.as33932.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0