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

Results forproverbs.mooclearningworld.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-10-24T17:59:53.073	2020-10-24T16:59:52	2021-01-22T16:59:52	coolincest.com	*.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-24T17:59:52.883	2020-10-24T16:59:52	2021-01-22T16:59:52	coolincest.com	*.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-24T04:07:25.679	2020-08-24T03:07:25	2020-11-22T03:07:25	mooclearningworld.com	*.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-24T04:07:25.449	2020-08-24T03:07:25	2020-11-22T03:07:25	mooclearningworld.com	*.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-07T06:22:58.363	2019-08-07T05:22:57	2019-11-05T05:22:57	proverbs.mooclearningworld.com	proverbs.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-07T06:22:57.951	2019-08-07T05:22:57	2019-11-05T05:22:57	proverbs.mooclearningworld.com	proverbs.mooclearningworld.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3