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

Results fornet.fallfund.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-04-21T00:19:32.626	2022-04-20T23:19:32	2022-07-19T23:19:31	savvas-pottery.net.fallfund.com	savvas-pottery.net.fallfund.com	C=US, O=Let's Encrypt, CN=R3
2022-04-21T00:19:32.442	2022-04-20T23:19:32	2022-07-19T23:19:31	savvas-pottery.net.fallfund.com	savvas-pottery.net.fallfund.com	C=US, O=Let's Encrypt, CN=R3
2022-02-05T21:19:24.282	2022-02-05T20:19:23	2022-05-06T20:19:22	bhagavatgita.org	leaselock.net.fallfund.com	C=US, O=Let's Encrypt, CN=R3
2022-02-05T21:19:23.997	2022-02-05T20:19:23	2022-05-06T20:19:22	bhagavatgita.org	leaselock.net.fallfund.com	C=US, O=Let's Encrypt, CN=R3