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

Results for*.plexcon.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-03-15T02:26:14.539	2021-03-06T00:00:00	2022-03-06T23:59:59	plexcon.com	*.plexcon.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-15T02:26:14.539	2021-03-06T00:00:00	2022-03-06T23:59:59	plexcon.com	*.plexcon.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-06T08:53:51.61	2021-03-06T00:00:00	2022-03-06T23:59:59	plexcon.com	*.plexcon.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-06T08:53:51.61	2021-03-06T00:00:00	2022-03-06T23:59:59	plexcon.com	*.plexcon.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1