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

Results for*.nadki.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-08-25T00:02:03.896	2021-08-11T00:00:00	2022-08-11T23:59:59	nadki.com	*.nadki.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-08-25T00:02:03.896	2021-08-11T00:00:00	2022-08-11T23:59:59	nadki.com	*.nadki.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-08-11T12:06:27.732	2021-08-11T00:00:00	2022-08-11T23:59:59	nadki.com	*.nadki.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-08-11T12:06:27.732	2021-08-11T00:00:00	2022-08-11T23:59:59	nadki.com	*.nadki.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1