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

Results for*.donkdj.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-09-18T10:11:42.621	2020-09-18T09:11:42	2020-12-17T09:11:42	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-09-18T10:11:42.621	2020-09-18T09:11:42	2020-12-17T09:11:42	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-09-18T10:11:42.46	2020-09-18T09:11:42	2020-12-17T09:11:42	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-09-18T10:11:42.46	2020-09-18T09:11:42	2020-12-17T09:11:42	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-17T06:53:22.902	2020-07-17T05:53:22	2020-10-15T05:53:22	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-17T06:53:22.902	2020-07-17T05:53:22	2020-10-15T05:53:22	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-17T06:53:22.565	2020-07-17T05:53:22	2020-10-15T05:53:22	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-17T06:53:22.565	2020-07-17T05:53:22	2020-10-15T05:53:22	donkdj.com	*.donkdj.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3