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

Results forbeta.admin.qafcom.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-04-09T04:14:36	2019-04-09T03:14:35	2019-07-08T03:14:35	twohandtouch.me	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-09T04:14:35.398	2019-04-09T03:14:35	2019-07-08T03:14:35	twohandtouch.me	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T19:13:48.052	2019-02-09T18:13:47	2019-05-10T18:13:47	www.maildo.app	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T19:13:47.284	2019-02-09T18:13:47	2019-05-10T18:13:47	www.maildo.app	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T17:33:06.515	2019-02-09T16:33:05	2019-05-10T16:33:05	beta.admin.qafcom.com	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T17:33:05.981	2019-02-09T16:33:05	2019-05-10T16:33:05	beta.admin.qafcom.com	beta.admin.qafcom.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3