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

Results forwww.rd.datetimeoffset.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-08T15:01:02.911	2025-11-08T14:02:32	2026-02-06T14:02:31	www.rd.datetimeoffset.com	www.rd.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R12
2025-11-08T15:01:02.716	2025-11-08T14:02:32	2026-02-06T14:02:31	www.rd.datetimeoffset.com	www.rd.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R12
2025-08-03T01:00:04.805	2025-08-03T00:01:34	2025-11-01T00:01:33	www.rd.datetimeoffset.com	www.rd.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R10
2025-08-03T01:00:04.492	2025-08-03T00:01:34	2025-11-01T00:01:33	www.rd.datetimeoffset.com	www.rd.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R10