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

Results forportainer.pi.fusionkoding.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2023-09-03T01:13:13.229	2023-09-03T00:13:12	2023-12-02T00:13:11	portainer.pi.fusionkoding.com	portainer.pi.fusionkoding.com	C=US, O=Let's Encrypt, CN=R3
2023-09-03T01:13:12.95	2023-09-03T00:13:12	2023-12-02T00:13:11	portainer.pi.fusionkoding.com	portainer.pi.fusionkoding.com	C=US, O=Let's Encrypt, CN=R3
2023-09-02T02:12:31.922	2023-09-02T01:12:31	2023-12-01T01:12:30	portainer.pi.fusionkoding.com	portainer.pi.fusionkoding.com	C=US, O=Let's Encrypt, CN=R3
2023-09-02T02:12:31.565	2023-09-02T01:12:31	2023-12-01T01:12:30	portainer.pi.fusionkoding.com	portainer.pi.fusionkoding.com	C=US, O=Let's Encrypt, CN=R3