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

Results forinbound.clienti.dk

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-02-15T14:33:35.538	2021-02-15T00:00:00	2022-02-14T23:59:59	clienti.dk	*.clienti.dk	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2021-02-15T14:33:34.691	2021-02-15T00:00:00	2022-02-14T23:59:59	clienti.dk	*.clienti.dk	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc RSA CA-2
2018-11-16T02:45:14.081	2018-06-21T00:00:00	2019-06-21T12:00:00	inbound.clienti.dk	inbound.clienti.dk	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-06-21T07:33:55.598	2018-06-21T00:00:00	2019-06-21T12:00:00	inbound.clienti.dk	inbound.clienti.dk	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-06-21T07:33:50.797	2018-06-21T00:00:00	2019-06-21T12:00:00	inbound.clienti.dk	inbound.clienti.dk	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc RSA CA-1