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

Results for*.purehtml.de

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-10-04T17:10:00.364	2021-10-04T00:00:00	2022-10-04T23:59:59	purehtml.de	*.purehtml.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-10-04T17:10:00.364	2021-10-04T00:00:00	2022-10-04T23:59:59	purehtml.de	*.purehtml.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-27T10:25:47.691	2020-08-27T00:00:00	2021-08-27T12:00:00	*.purehtml.de	*.purehtml.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-08-27T10:25:47.691	2020-08-27T00:00:00	2021-08-27T12:00:00	*.purehtml.de	*.purehtml.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1