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

Results fororg.vectorized.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-11-30T04:46:36.339	2022-11-30T03:46:35	2023-02-28T03:46:34	comet.vc	arbitrageadvisor.org.vectorized.com	C=US, O=Let's Encrypt, CN=R3
2022-11-30T04:46:35.887	2022-11-30T03:46:35	2023-02-28T03:46:34	comet.vc	arbitrageadvisor.org.vectorized.com	C=US, O=Let's Encrypt, CN=R3
2021-05-09T11:19:47.046	2021-05-09T10:19:46	2021-08-07T10:19:46	noctrog.xyz.cutamerica.com	fundesign.org.vectorized.com	C=US, O=Let's Encrypt, CN=R3
2021-05-09T11:19:45.189	2021-05-09T10:19:46	2021-08-07T10:19:46	noctrog.xyz.cutamerica.com	fundesign.org.vectorized.com	C=US, O=Let's Encrypt, CN=R3