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

Results forww25.backup.mirrorstack.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-07T17:28:12.206	2025-11-07T16:29:41	2026-02-05T16:29:40	ww25.backup.mirrorstack.com	ww25.backup.mirrorstack.com	C=US, O=Let's Encrypt, CN=R12
2025-11-07T17:28:11.833	2025-11-07T16:29:41	2026-02-05T16:29:40	ww25.backup.mirrorstack.com	ww25.backup.mirrorstack.com	C=US, O=Let's Encrypt, CN=R12
2025-08-09T14:26:12.318	2025-08-09T13:27:41	2025-11-07T13:27:40	ww25.backup.mirrorstack.com	ww25.backup.mirrorstack.com	C=US, O=Let's Encrypt, CN=R11
2025-08-09T14:26:11.97	2025-08-09T13:27:41	2025-11-07T13:27:40	ww25.backup.mirrorstack.com	ww25.backup.mirrorstack.com	C=US, O=Let's Encrypt, CN=R11