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

Results forpolus500.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-12T12:26:22.559	2021-06-12T11:26:22	2021-09-10T11:26:21	forest.pizza	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-06-12T12:26:22.465	2021-06-12T11:26:22	2021-09-10T11:26:21	forest.pizza	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-29T10:04:22.567	2021-05-29T09:04:22	2021-08-27T09:04:22	quantumarbitrage.de	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-29T10:04:22.116	2021-05-29T09:04:22	2021-08-27T09:04:22	quantumarbitrage.de	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-17T11:44:53.649	2021-05-17T10:44:53	2021-08-15T10:44:53	polus500.com	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-17T11:44:53.523	2021-05-17T10:44:53	2021-08-15T10:44:53	polus500.com	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-01T07:21:29.959	2021-05-01T06:21:29	2021-07-30T06:21:29	polus500.com	polus500.com	C=US, O=Let's Encrypt, CN=R3
2021-05-01T07:21:29.762	2021-05-01T06:21:29	2021-07-30T06:21:29	polus500.com	polus500.com	C=US, O=Let's Encrypt, CN=R3