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

Results for*.britax.org

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-11-08T02:44:09.034	2019-11-04T00:00:00	2020-11-04T12:00:00	britax.org	*.britax.org	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-11-08T02:44:09.034	2019-11-04T00:00:00	2020-11-04T12:00:00	britax.org	*.britax.org	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-11-04T23:46:10.998	2019-11-04T00:00:00	2020-11-04T12:00:00	britax.org	*.britax.org	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-11-04T23:46:10.998	2019-11-04T00:00:00	2020-11-04T12:00:00	britax.org	*.britax.org	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1