tg.summitiig.net has no CNAME records.
Question and response
Question
dig tg.summitiig.net. NS
Answer
The response has no answer records.
Authority
summitiig.net. 3448 SOA ns1.summitiig.net. admin.summitiig.net. 2021100934 3600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0