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

Results for*.contengo.de

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-12-31T06:50:00.777	2021-09-04T00:00:00	2022-09-04T23:59:59	contengo.de	*.contengo.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-12-31T06:50:00.777	2021-09-04T00:00:00	2022-09-04T23:59:59	contengo.de	*.contengo.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-09-04T09:40:07.282	2021-09-04T00:00:00	2022-09-04T23:59:59	contengo.de	*.contengo.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-09-04T09:40:07.282	2021-09-04T00:00:00	2022-09-04T23:59:59	contengo.de	*.contengo.de	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1