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

Results forworkq.co

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-08-01T10:15:43.951	2019-08-01T09:15:43	2019-10-30T09:15:43	w3n14izy.cf	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-01T10:15:43.033	2019-08-01T09:15:43	2019-10-30T09:15:43	w3n14izy.cf	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-01T08:25:13.947	2019-08-01T07:25:13	2019-10-30T07:25:13	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-01T08:25:13.586	2019-08-01T07:25:13	2019-10-30T07:25:13	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-03T21:44:38.152	2019-05-03T20:44:37	2019-08-01T20:44:37	www.breagy.com	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-03T21:44:37.159	2019-05-03T20:44:37	2019-08-01T20:44:37	www.breagy.com	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T10:44:46.826	2019-03-06T09:44:46	2019-06-04T09:44:46	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T10:44:46.196	2019-03-06T09:44:46	2019-06-04T09:44:46	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T07:52:21.863	2019-03-06T06:52:21	2019-06-04T06:52:21	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T07:52:21.299	2019-03-06T06:52:21	2019-06-04T06:52:21	workq.co	workq.co	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3