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

Results forserver.atcoengineering.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-08-03T04:57:50.59	2025-08-03T03:59:18	2025-11-01T03:59:17	server.atcoengineering.com	server.atcoengineering.com	C=US, O=Let's Encrypt, CN=R10
2025-08-03T04:57:48.353	2025-08-03T03:59:18	2025-11-01T03:59:17	server.atcoengineering.com	server.atcoengineering.com	C=US, O=Let's Encrypt, CN=R10
2025-05-11T00:09:14.081	2025-05-10T23:10:41	2025-08-08T23:10:40	server.atcoengineering.com	server.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11
2025-05-11T00:09:11.659	2025-05-10T23:10:41	2025-08-08T23:10:40	server.atcoengineering.com	server.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11