ntp.summitiig.net has no CNAME records.
Question and response
Question
dig ntp.summitiig.net. NS
Answer
The response has no answer records.
Authority
summitiig.net. 10800 SOA ns1.summitiig.net. admin.summitiig.net. 2021100934 3600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0