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

Results for*.domainmonger.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-04-29T18:16:24.534	2018-04-23T00:00:00	2019-01-25T12:00:00	*.domainmonger.com	*.domainmonger.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=RapidSSL RSA CA 2018
2018-04-29T18:16:24.534	2018-04-23T00:00:00	2019-01-25T12:00:00	*.domainmonger.com	*.domainmonger.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=RapidSSL RSA CA 2018
2018-04-23T21:19:46.714	2018-04-23T00:00:00	2019-01-25T12:00:00	*.domainmonger.com	*.domainmonger.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=RapidSSL RSA CA 2018
2018-04-23T21:19:46.714	2018-04-23T00:00:00	2019-01-25T12:00:00	*.domainmonger.com	*.domainmonger.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=RapidSSL RSA CA 2018
2016-01-27T12:48:57.805	2016-01-24T20:46:02	2019-01-26T09:33:51	*.domainmonger.com	*.domainmonger.com	C=US, O=GeoTrust Inc., CN=RapidSSL SHA256 CA - G3
2016-01-27T12:48:57.805	2016-01-24T20:46:02	2019-01-26T09:33:51	*.domainmonger.com	*.domainmonger.com	C=US, O=GeoTrust Inc., CN=RapidSSL SHA256 CA - G3