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

Results forhostmaster.bolthawk.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-12T23:50:10.891	2021-06-09T00:00:00	2022-06-09T23:59:59	bolthawk.com	*.bolthawk.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-06-09T03:14:51.363	2021-06-09T00:00:00	2022-06-09T23:59:59	bolthawk.com	*.bolthawk.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-06-13T13:42:37.113	2020-06-07T00:00:00	2021-06-08T12:00:00	bolthawk.com	*.bolthawk.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-06-07T20:32:13.299	2020-06-07T00:00:00	2021-06-08T12:00:00	bolthawk.com	*.bolthawk.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1