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

Results formain.cryptoing.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-04-20T04:52:50.357	2022-04-20T03:52:49	2022-07-19T03:52:48	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2022-04-20T04:52:49.998	2022-04-20T03:52:49	2022-07-19T03:52:48	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2022-02-18T15:52:35.824	2022-02-18T14:52:35	2022-05-19T14:52:34	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2022-02-18T15:52:35.611	2022-02-18T14:52:35	2022-05-19T14:52:34	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2021-12-15T03:23:17.055	2021-12-15T02:23:16	2022-03-15T02:23:15	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2021-12-15T03:23:16.819	2021-12-15T02:23:16	2022-03-15T02:23:15	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2021-10-15T16:28:43.04	2021-10-15T15:28:42	2022-01-13T15:28:41	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3
2021-10-15T16:28:42.426	2021-10-15T15:28:42	2022-01-13T15:28:41	main.cryptoing.com	main.cryptoing.com	C=US, O=Let's Encrypt, CN=R3