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

Results forstaging.refineryengineer.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-08-05T14:42:24.52	2025-08-05T13:43:52	2025-11-03T13:43:51	staging.refineryengineer.com	staging.refineryengineer.com	C=US, O=Let's Encrypt, CN=R10
2025-08-05T14:42:22.378	2025-08-05T13:43:52	2025-11-03T13:43:51	staging.refineryengineer.com	staging.refineryengineer.com	C=US, O=Let's Encrypt, CN=R10
2024-08-10T08:01:47.33	2024-08-10T07:03:16	2024-11-08T07:03:15	staging.refineryengineer.com	staging.refineryengineer.com	C=US, O=Let's Encrypt, CN=R11
2024-08-10T08:01:46.998	2024-08-10T07:03:16	2024-11-08T07:03:15	staging.refineryengineer.com	staging.refineryengineer.com	C=US, O=Let's Encrypt, CN=R11