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

Results for*.wavever.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-09-19T00:47:20.143	2018-09-18T23:47:19	2018-12-17T23:47:19	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-09-19T00:47:20.143	2018-09-18T23:47:19	2018-12-17T23:47:19	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-09-19T00:47:19.445	2018-09-18T23:47:19	2018-12-17T23:47:19	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-09-19T00:47:19.445	2018-09-18T23:47:19	2018-12-17T23:47:19	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-11T01:28:52.118	2018-07-11T00:28:51	2018-10-09T00:28:51	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-11T01:28:52.118	2018-07-11T00:28:51	2018-10-09T00:28:51	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-11T01:28:51.176	2018-07-11T00:28:51	2018-10-09T00:28:51	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-07-11T01:28:51.176	2018-07-11T00:28:51	2018-10-09T00:28:51	*.wavever.com	*.wavever.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3