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

Results forhumanapp.fr

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-08-25T04:02:48.231	2020-08-25T03:02:47	2020-11-23T03:02:47	sentinailes.humanapp.fr	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-25T04:02:47.638	2020-08-25T03:02:47	2020-11-23T03:02:47	sentinailes.humanapp.fr	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-26T07:49:29.893	2020-06-26T06:49:29	2020-09-24T06:49:29	stage.subspace-events.com	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-26T07:49:29.682	2020-06-26T06:49:29	2020-09-24T06:49:29	stage.subspace-events.com	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-28T20:19:43.521	2020-04-28T19:19:43	2020-07-27T19:19:43	polishlink.info	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-28T20:19:43.33	2020-04-28T19:19:43	2020-07-27T19:19:43	polishlink.info	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-28T16:54:32.734	2020-04-28T15:54:32	2020-07-27T15:54:32	sentinailes.humanapp.fr	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-04-28T16:54:32.52	2020-04-28T15:54:32	2020-07-27T15:54:32	sentinailes.humanapp.fr	sentinailes.humanapp.fr	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3