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

Results forapi.dev.elitit.hu

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-09-14T07:59:02.248	2021-09-14T06:59:02	2021-12-13T06:59:01	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2021-09-14T07:59:02.07	2021-09-14T06:59:02	2021-12-13T06:59:01	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2021-04-26T23:13:42.939	2021-04-26T22:13:42	2021-07-25T22:13:42	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2021-04-26T23:13:42.737	2021-04-26T22:13:42	2021-07-25T22:13:42	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2021-02-25T19:27:57.644	2021-02-25T18:27:57	2021-05-26T18:27:57	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2021-02-25T19:27:57.447	2021-02-25T18:27:57	2021-05-26T18:27:57	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2020-12-27T18:33:46.442	2020-12-27T17:33:46	2021-03-27T17:33:46	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3
2020-12-27T18:33:46.235	2020-12-27T17:33:46	2021-03-27T17:33:46	api.dev.elitit.hu	api.dev.elitit.hu	C=US, O=Let's Encrypt, CN=R3