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

Results formaster2.fastbighost.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-04-08T12:36:37.455	2019-04-08T00:00:00	2020-07-06T23:59:59	*.fastbighost.com	*.fastbighost.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2019-04-08T12:36:19.631	2019-04-08T00:00:00	2020-07-06T23:59:59	*.fastbighost.com	*.fastbighost.com	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2018-04-18T10:43:54.521	2018-04-18T00:00:00	2019-04-18T23:59:59	*.fastbighost.com	*.fastbighost.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA
2018-04-18T10:43:27.46	2018-04-18T00:00:00	2019-04-18T23:59:59	*.fastbighost.com	*.fastbighost.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA