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

Results fornet.frfi.ie

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-07-14T20:45:30.681	2022-07-14T19:45:29	2022-10-12T19:45:28	tigermarketing.net.frfi.ie	tigermarketing.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3
2022-07-14T20:45:30.031	2022-07-14T19:45:29	2022-10-12T19:45:28	tigermarketing.net.frfi.ie	tigermarketing.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3
2021-12-02T05:23:56.152	2021-12-02T04:23:55	2022-03-02T04:23:54	bigotix.com.violinepassagen.de	festavus.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3
2021-12-02T05:23:55.891	2021-12-02T04:23:55	2022-03-02T04:23:54	bigotix.com.violinepassagen.de	festavus.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3
2021-07-17T19:00:58.763	2021-07-17T18:00:58	2021-10-15T18:00:56	frfi.ie	awakesouls.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3
2021-07-17T19:00:58.608	2021-07-17T18:00:58	2021-10-15T18:00:56	frfi.ie	awakesouls.net.frfi.ie	C=US, O=Let's Encrypt, CN=R3