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

Results for*.guestbind.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-10-02T18:16:04.999	2020-09-25T00:00:00	2021-09-26T12:00:00	guestbind.com	*.guestbind.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-10-02T18:16:04.999	2020-09-25T00:00:00	2021-09-26T12:00:00	guestbind.com	*.guestbind.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-09-25T20:39:50.244	2020-09-25T00:00:00	2021-09-26T12:00:00	guestbind.com	*.guestbind.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-09-25T20:39:50.244	2020-09-25T00:00:00	2021-09-26T12:00:00	guestbind.com	*.guestbind.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1