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

Results foreditor.stellar.spunk.link

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-08-28T10:30:24.883	2021-08-26T02:57:07	2021-11-24T02:57:06	www.rssecurity.cl	editor.stellar.spunk.link	C=US, O=Google Trust Services LLC, CN=GTS CA 1D4
2021-08-26T03:59:39.01	2021-08-26T02:57:07	2021-11-24T02:57:06	www.rssecurity.cl	editor.stellar.spunk.link	C=US, O=Google Trust Services LLC, CN=GTS CA 1D4
2021-07-02T10:08:06.924	2021-06-29T11:46:51	2021-09-27T12:46:51	app.mehub.cz	editor.stellar.spunk.link	C=US, O=Google Trust Services LLC, CN=GTS CA 1D4
2021-06-29T12:48:47.777	2021-06-29T11:46:51	2021-09-27T12:46:51	app.mehub.cz	editor.stellar.spunk.link	C=US, O=Google Trust Services LLC, CN=GTS CA 1D4
2021-06-29T09:20:57.623	2021-06-29T08:20:57	2021-09-27T08:20:56	editor.stellar.spunk.link	editor.stellar.spunk.link	C=US, O=Let's Encrypt, CN=R3
2021-06-29T09:20:57.32	2021-06-29T08:20:57	2021-09-27T08:20:56	editor.stellar.spunk.link	editor.stellar.spunk.link	C=US, O=Let's Encrypt, CN=R3