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

Results for*.docksforrent.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-02-06T17:31:38.403	2019-02-06T16:31:37	2019-05-07T16:31:37	compareonlineshopping.com	*.docksforrent.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-06T17:31:38.403	2019-02-06T16:31:37	2019-05-07T16:31:37	compareonlineshopping.com	*.docksforrent.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-06T17:31:37.541	2019-02-06T16:31:37	2019-05-07T16:31:37	compareonlineshopping.com	*.docksforrent.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-06T17:31:37.541	2019-02-06T16:31:37	2019-05-07T16:31:37	compareonlineshopping.com	*.docksforrent.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3