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

Results forknightssoft.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-09-03T00:14:25.448	2019-09-02T23:14:24	2019-12-01T23:14:24	cinadeperu.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-09-03T00:14:24.823	2019-09-02T23:14:24	2019-12-01T23:14:24	cinadeperu.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-07-04T13:44:09.906	2019-07-04T12:44:08	2019-10-02T12:44:08	knightssoft.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-07-04T13:44:08.7	2019-07-04T12:44:08	2019-10-02T12:44:08	knightssoft.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-07-04T11:23:03.643	2019-07-04T10:23:02	2019-10-02T10:23:02	knightssoft.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-07-04T11:23:02.495	2019-07-04T10:23:02	2019-10-02T10:23:02	knightssoft.com	knightssoft.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3