Apex domains cannot have CNAME records.
Apple
Domain verification
apple-domain-verification=VW8w2xDd8l279haj
Atlassian
Domain verification
atlassian-domain-verification=/sSbzjXmmSWiRV35Uwj5soKUruasgamoUI3nFYtQJH77JhaCTSRb3tvhpAluiXeF
Atlassian
Domain verification
atlassian-sending-domain-verification=43962073-ff4e-4f33-8231-095382997ef4
Autodesk
Domain verification
autodesk-domain-verification=PrUsYl7GCJ28UVvcnHdS
Facebook
Domain verification
facebook-domain-verification=6ow2wkmwo1vt2mn0thuhl5o5pru2w4
Google
Domain verification
google-site-verification=DHpCWTFmMtxLMD2du4CVQwZWl71LDwElQ7t0eABAigc
Google
Domain verification
google-site-verification=iRgyyZuSD0cwErXTsiPQxMf6Eao3OKZXzq9AlErRjZs
Have I been pwned
Domain verification
have-i-been-pwned-verification=dweb_pq2ki78ro3tnva4h9y1clx87
Microsoft
Domain verification
MS=ms92963420
Zone apex
Start of authority
Email
Serial
2017013000
Refresh
8h
Retry
2h
Expire
7d
Negative cache TTL
1d