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

Results forwww.zonotho.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-08-09T17:48:32.108	2020-08-09T16:48:31	2020-11-07T16:48:31	www.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-09T17:48:31.992	2020-08-09T16:48:31	2020-11-07T16:48:31	www.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-29T11:58:42.852	2020-06-29T10:58:42	2020-09-27T10:58:42	alpha.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-29T11:58:42.577	2020-06-29T10:58:42	2020-09-27T10:58:42	alpha.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-03T08:42:18.585	2020-06-03T07:42:18	2020-09-01T07:42:18	alpha.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-03T08:42:18.34	2020-06-03T07:42:18	2020-09-01T07:42:18	alpha.zonotho.com	www.zonotho.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3