Apex domains cannot have CNAME records.
Dynatrace
Domain verification
Dynatrace-site-verification=b5eb1e19-9c15-457c-8d3b-6320e3cea0c9__nl5v5vejliqv4m6f8qi8rptkhc
GlobalSign
Domain verification
_globalsign-domain-verification=q7S9Pq0VzwJRasAeOabmezYos0AZhaH2emruDTexaW
GlobalSign
Domain verification
_globalsign-domain-verification=Vc5QP-5Fr4jNs2bFUP3BOjLpuWtIgQRo2wVIZs4QHD
Google
Domain verification
google-site-verification=0QWHqrEo3XLTScRP8GVeQ7mehRyESXVVWYTpjHiiOGU
Microsoft
Domain verification
MS=ms95161635
axway-amplify=9b79ce39-b103-4398-90f2-8e477589962d
axway-amplify=bdb249ac-f4d9-4cf7-8e48-5540172d3845
dtm-domain-verification=C94qs_xMYEAM8Q89nf3SXtSy-kViGDpHox6BxzkYQkU
rU7-HJ8-ER3
gov.sg has no MX records.
Zone apex
Start of authority
Email
Serial
2603062300
Refresh
45m
Retry
30m
Expire
28d
Negative cache TTL
1h