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

Results forcare.oneinvader.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-05-03T15:44:52.311	2019-05-03T14:44:51	2019-08-01T14:44:51	www.mnfprofile.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-03T15:44:51.376	2019-05-03T14:44:51	2019-08-01T14:44:51	www.mnfprofile.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-05T10:45:05.534	2019-03-05T09:45:04	2019-06-03T09:45:04	care.oneinvader.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-05T10:45:04.585	2019-03-05T09:45:04	2019-06-03T09:45:04	care.oneinvader.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-05T08:41:49.319	2019-03-05T07:41:48	2019-06-03T07:41:48	care.oneinvader.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-05T08:41:48.328	2019-03-05T07:41:48	2019-06-03T07:41:48	care.oneinvader.com	care.oneinvader.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3