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

Results forrdweb.atcoengineering.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-08-02T15:20:23.121	2025-08-02T14:21:50	2025-10-31T14:21:49	rdweb.atcoengineering.com	rdweb.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11
2025-08-02T15:20:20.894	2025-08-02T14:21:50	2025-10-31T14:21:49	rdweb.atcoengineering.com	rdweb.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11
2025-05-04T05:20:55.172	2025-05-04T04:22:24	2025-08-02T04:22:23	rdweb.atcoengineering.com	rdweb.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11
2025-05-04T05:20:54.931	2025-05-04T04:22:24	2025-08-02T04:22:23	rdweb.atcoengineering.com	rdweb.atcoengineering.com	C=US, O=Let's Encrypt, CN=R11