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

Results for*.mustakeonline.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-09-16T05:19:57.808	2019-09-16T04:19:57	2019-12-15T04:19:57	mustakeonline.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-09-16T05:19:57.808	2019-09-16T04:19:57	2019-12-15T04:19:57	mustakeonline.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-09-16T05:19:57.539	2019-09-16T04:19:57	2019-12-15T04:19:57	mustakeonline.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-09-16T05:19:57.539	2019-09-16T04:19:57	2019-12-15T04:19:57	mustakeonline.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-21T05:58:11.313	2019-04-21T04:58:10	2019-07-20T04:58:10	darcees.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-21T05:58:11.313	2019-04-21T04:58:10	2019-07-20T04:58:10	darcees.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-21T05:58:10.181	2019-04-21T04:58:10	2019-07-20T04:58:10	darcees.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-21T05:58:10.181	2019-04-21T04:58:10	2019-07-20T04:58:10	darcees.com	*.mustakeonline.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3