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

Results fortimeline-test.drcdev.ca

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-04-08T13:14:37.497	2019-04-08T12:14:35	2019-07-07T12:14:35	www.adhix11.com	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-08T13:14:35.888	2019-04-08T12:14:35	2019-07-07T12:14:35	www.adhix11.com	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T08:14:04.953	2019-02-09T07:14:04	2019-05-10T07:14:04	timeline-test.drcdev.ca	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T08:14:04.197	2019-02-09T07:14:04	2019-05-10T07:14:04	timeline-test.drcdev.ca	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T06:17:51.702	2019-02-09T05:17:50	2019-05-10T05:17:50	timeline-test.drcdev.ca	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-09T06:17:50.794	2019-02-09T05:17:50	2019-05-10T05:17:50	timeline-test.drcdev.ca	timeline-test.drcdev.ca	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3