enter.ups.com has no CNAME records.
Question and response
Question
dig enter.ups.com. NS
Answer
The response has no answer records.
Authority
ups.com. 2695 SOA ibx.ups.com. hostmaster.nowhere.null. 2023427839 21600 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0