massgateway1b.dhl.com has no CNAME records.
Question and response
Question
dig massgateway1b.dhl.com. NS
Answer
The response has no answer records.
Authority
dhl.com. 300 SOA ns4.dhl.com. netmaster.dhl.com. 2016118556 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0