nagios.datamotion.com has no CNAME records.
Question and response
Question
dig nagios.datamotion.com. NS
Answer
The response has no answer records.
Authority
datamotion.com. 1246 SOA ns1-06.azure-dns.com. azuredns-hostmaster.microsoft.com.datamotion.com. 2023041108 3600 120 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0