Apex domains cannot have CNAME records.
Facebook
Domain verification
facebook-domain-verification=e750ewnqm68u4f83wvp6qp7iiphkj0
GlobalSign
Domain verification
_globalsign-domain-verification=FYNrZOjd0nwykdGaq5RScacoSImqU9YxFXm4RjGTwd
Google
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google-site-verification=bDiyjBjCnMbct5cB1XZXOj5gQ0YcatJqTZUxFBo55nE
Google
Domain verification
google-site-verification=Xj1hw8lKZK7dkCP6SCfNi98SvjacNHoNCVrFbJCZfio
Have I been pwned
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have-i-been-pwned-verification=13c7b50cd0b12f85dabe796e6178fb74
Mail.ru
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mailru-verification: 530c425b1458283e
Microsoft
Domain verification
MS=ms75457885
Zone apex
Start of authority
Email
Serial
2023037784
Refresh
10m
Retry
5m
Expire
30d
Negative cache TTL
15m