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

Results forapps.alshakib.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-03-03T09:49:44.28	2020-03-03T08:49:44	2020-06-01T08:49:44	beta.familytools.app	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-03-03T09:49:44.125	2020-03-03T08:49:44	2020-06-01T08:49:44	beta.familytools.app	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-05T05:28:29.676	2020-01-05T04:28:29	2020-04-04T04:28:29	thinclab.works	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-05T05:28:29.489	2020-01-05T04:28:29	2020-04-04T04:28:29	thinclab.works	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-05T01:41:17.816	2020-01-05T00:41:17	2020-04-04T00:41:17	apps.alshakib.dev	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-05T01:41:17.651	2020-01-05T00:41:17	2020-04-04T00:41:17	apps.alshakib.dev	apps.alshakib.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3