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

Results forenterpriseregistration.charm.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-02-02T18:38:33.276	2021-02-02T18:38:26	2022-01-03T12:28:23	tc7.charm.com	enterpriseregistration.charm.com	C=US, ST=Arizona, L=Scottsdale, O="Starfield Technologies, Inc.", OU=http://certs.starfieldtech.com/repository/, CN=Starfield Secure Certificate Authority - G2
2021-02-02T17:28:33.188	2021-02-02T17:28:31	2022-01-03T12:28:23	tc7.charm.com	enterpriseregistration.charm.com	C=US, ST=Arizona, L=Scottsdale, O="Starfield Technologies, Inc.", OU=http://certs.starfieldtech.com/repository/, CN=Starfield Secure Certificate Authority - G2
2020-12-02T12:28:25.202	2020-12-02T12:28:23	2022-01-03T12:28:23	tc7.charm.com	enterpriseregistration.charm.com	C=US, ST=Arizona, L=Scottsdale, O="Starfield Technologies, Inc.", OU=http://certs.starfieldtech.com/repository/, CN=Starfield Secure Certificate Authority - G2
2019-08-16T12:16:31.703	2018-01-31T21:30:01	2021-01-31T21:30:01	tc7.charm.com	enterpriseregistration.charm.com	C=US, ST=Arizona, L=Scottsdale, O="Starfield Technologies, Inc.", OU=http://certs.starfieldtech.com/repository/, CN=Starfield Secure Certificate Authority - G2