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

Results for*.poskode.net

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-03-11T22:07:21.573	2021-03-02T00:00:00	2022-03-02T23:59:59	poskode.net	*.poskode.net	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-11T22:07:21.573	2021-03-02T00:00:00	2022-03-02T23:59:59	poskode.net	*.poskode.net	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-02T15:03:13.121	2021-03-02T00:00:00	2022-03-02T23:59:59	poskode.net	*.poskode.net	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-03-02T15:03:13.121	2021-03-02T00:00:00	2022-03-02T23:59:59	poskode.net	*.poskode.net	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1