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

Results for*.excelmac.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-07-15T16:33:59.628	2020-07-13T00:00:00	2021-07-14T12:00:00	excelmac.com	*.excelmac.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-07-15T16:33:59.628	2020-07-13T00:00:00	2021-07-14T12:00:00	excelmac.com	*.excelmac.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-07-13T19:35:46.833	2020-07-13T00:00:00	2021-07-14T12:00:00	excelmac.com	*.excelmac.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-07-13T19:35:46.833	2020-07-13T00:00:00	2021-07-14T12:00:00	excelmac.com	*.excelmac.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1