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

Results for*.pencol.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-03-06T11:34:35.899	2019-03-06T10:34:34	2019-06-04T10:34:34	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T11:34:35.899	2019-03-06T10:34:34	2019-06-04T10:34:34	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T11:34:34.616	2019-03-06T10:34:34	2019-06-04T10:34:34	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T11:34:34.616	2019-03-06T10:34:34	2019-06-04T10:34:34	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-12-16T23:56:34.378	2018-12-16T22:56:33	2019-03-16T22:56:33	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-12-16T23:56:34.378	2018-12-16T22:56:33	2019-03-16T22:56:33	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-12-16T23:56:33.803	2018-12-16T22:56:33	2019-03-16T22:56:33	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-12-16T23:56:33.803	2018-12-16T22:56:33	2019-03-16T22:56:33	pencol.com	*.pencol.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3