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

Results for*.mirrorthat.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-11-06T09:05:33.305	2020-10-31T00:00:00	2021-10-31T23:59:59	mirrorthat.com	*.mirrorthat.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-11-06T09:05:33.305	2020-10-31T00:00:00	2021-10-31T23:59:59	mirrorthat.com	*.mirrorthat.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-31T03:10:02.485	2020-10-31T00:00:00	2021-10-31T23:59:59	mirrorthat.com	*.mirrorthat.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-31T03:10:02.485	2020-10-31T00:00:00	2021-10-31T23:59:59	mirrorthat.com	*.mirrorthat.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1