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

Results forwebdisk.uniqueinteractions.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-03-01T08:07:00.078	2021-03-01T00:00:00	2021-05-30T23:59:59	uniqueinteractions.com	webdisk.uniqueinteractions.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2021-03-01T08:06:59.29	2021-03-01T00:00:00	2021-05-30T23:59:59	uniqueinteractions.com	webdisk.uniqueinteractions.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-08-06T16:52:28.334	2020-08-06T15:52:28	2020-11-04T15:52:28	uniqueinteractions.com	*.uniqueinteractions.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-08-06T16:52:28.187	2020-08-06T15:52:28	2020-11-04T15:52:28	uniqueinteractions.com	*.uniqueinteractions.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3