It can be anything! An apex, subdomain, or even a URL.

Results for*.efa.vc

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-03-08T17:30:29.177	2021-03-08T00:00:00	2022-03-08T23:59:59	efa.vc	*.efa.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-08T17:30:29.177	2021-03-08T00:00:00	2022-03-08T23:59:59	efa.vc	*.efa.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-08T17:30:25.256	2021-03-08T00:00:00	2022-03-08T23:59:59	efa.vc	*.efa.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-08T17:30:25.256	2021-03-08T00:00:00	2022-03-08T23:59:59	efa.vc	*.efa.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1