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

Results forprojects.tcocker.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-08-08T11:44:03.882	2019-08-08T10:44:03	2019-11-06T10:44:03	www.dubbiebee.com	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-08T11:44:03.095	2019-08-08T10:44:03	2019-11-06T10:44:03	www.dubbiebee.com	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-07T16:44:54.989	2019-06-07T15:44:54	2019-09-05T15:44:54	god.jollydoc.in	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-07T16:44:54.154	2019-06-07T15:44:54	2019-09-05T15:44:54	god.jollydoc.in	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-08T19:48:29.663	2019-04-08T18:48:28	2019-07-07T18:48:28	projects.tcocker.dev	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-08T19:48:28.303	2019-04-08T18:48:28	2019-07-07T18:48:28	projects.tcocker.dev	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-08T17:00:49.205	2019-04-08T16:00:48	2019-07-07T16:00:48	projects.tcocker.dev	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-08T17:00:48.42	2019-04-08T16:00:48	2019-07-07T16:00:48	projects.tcocker.dev	projects.tcocker.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3