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

Results for*.rotel.co

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-12-28T11:14:58.779	2019-12-26T00:00:00	2020-12-26T12:00:00	rotel.co	*.rotel.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-12-28T11:14:58.779	2019-12-26T00:00:00	2020-12-26T12:00:00	rotel.co	*.rotel.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-12-26T06:49:06.946	2019-12-26T00:00:00	2020-12-26T12:00:00	rotel.co	*.rotel.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-12-26T06:49:06.946	2019-12-26T00:00:00	2020-12-26T12:00:00	rotel.co	*.rotel.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1