ec.ups.com has no CNAME records.
Question and response
Question
dig ec.ups.com. NS
Answer
The response has no answer records.
Authority
ups.com. 2757 SOA ibx.ups.com. hostmaster.nowhere.null. 2023427891 21600 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0