ha1.markmonitor.zone has no CNAME records.
Question and response
Question
dig ha1.markmonitor.zone. NS
Answer
The response has no answer records.
Authority
markmonitor.zone. 5843 SOA ns1.markmonitor.com. hostmaster.markmonitor.com. 2025062401 86400 3600 2592000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0