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

Results forwww.pushtech.org

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-08-03T13:31:00.859	2021-08-03T12:31:00	2021-11-01T12:30:58	www.pushtech.org	www.pushtech.org	C=US, O=Let's Encrypt, CN=R3
2021-08-03T13:31:00.186	2021-08-03T12:31:00	2021-11-01T12:30:58	www.pushtech.org	www.pushtech.org	C=US, O=Let's Encrypt, CN=R3
2021-07-02T17:03:42.421	2021-07-02T16:03:42	2021-09-30T16:03:41	pushtech.org	www.pushtech.org	C=US, O=Let's Encrypt, CN=R3
2021-07-02T17:03:42.215	2021-07-02T16:03:42	2021-09-30T16:03:41	pushtech.org	www.pushtech.org	C=US, O=Let's Encrypt, CN=R3
2020-08-01T19:15:10.958	2020-08-01T18:15:10	2020-10-30T18:15:10	psychedelic24.com	www.pushtech.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-01T19:15:10.78	2020-08-01T18:15:10	2020-10-30T18:15:10	psychedelic24.com	www.pushtech.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3