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

Results for*.highkeys.de

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-04-19T07:04:38.692	2021-09-11T00:00:00	2022-09-11T23:59:59	highkeys.de	*.highkeys.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2022-04-19T07:04:38.692	2021-09-11T00:00:00	2022-09-11T23:59:59	highkeys.de	*.highkeys.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-09-11T22:08:03.831	2021-09-11T00:00:00	2022-09-11T23:59:59	highkeys.de	*.highkeys.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-09-11T22:08:03.831	2021-09-11T00:00:00	2022-09-11T23:59:59	highkeys.de	*.highkeys.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1