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

Results fortest.api.updates.remundo.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2023-07-03T10:33:39.845	2023-07-03T09:33:39	2023-10-01T09:33:38	test.api.updates.remundo.com	test.api.updates.remundo.com	C=US, O=Let's Encrypt, CN=R3
2023-07-03T10:33:39.646	2023-07-03T09:33:39	2023-10-01T09:33:38	test.api.updates.remundo.com	test.api.updates.remundo.com	C=US, O=Let's Encrypt, CN=R3
2023-04-19T11:33:17.073	2023-04-19T10:33:16	2023-07-18T10:33:15	test.api.updates.remundo.com	test.api.updates.remundo.com	C=US, O=Let's Encrypt, CN=R3
2023-04-19T11:33:16.883	2023-04-19T10:33:16	2023-07-18T10:33:15	test.api.updates.remundo.com	test.api.updates.remundo.com	C=US, O=Let's Encrypt, CN=R3