mrtg.summitiig.net has no CNAME records.
Question and response
Question
dig mrtg.summitiig.net. NS
Answer
The response has no answer records.
Authority
summitiig.net. 9418 SOA ns1.summitiig.net. admin.summitiig.net. 2021100933 3600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0