dns2.nic.aws has no CNAME records.
Question and response
Question
dig dns2.nic.aws. NS
Answer
The response has no answer records.
Authority
nic.aws. 1716 SOA dns1.nic.aws. hostmaster.nominet.org.uk. 1708432091 900 300 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0