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

Results fordeveloper.haller.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-11-29T16:17:01.521	2021-11-29T00:00:00	2022-11-29T23:59:59	developer.haller.dev	developer.haller.dev	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-12-12T07:52:15.221	2020-12-09T00:00:00	2021-12-09T23:59:59	haller.dev	*.haller.dev	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-12-09T08:30:56.935	2020-12-09T00:00:00	2021-12-09T23:59:59	haller.dev	*.haller.dev	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-01-14T00:35:06.601	2019-12-06T00:00:00	2020-12-06T12:00:00	haller.dev	*.haller.dev	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-12-06T08:13:43.763	2019-12-06T00:00:00	2020-12-06T12:00:00	haller.dev	*.haller.dev	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1