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

Results formembers.datetimeoffset.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2026-01-10T19:52:17.222	2026-01-10T18:53:45	2026-04-10T18:53:44	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R12
2026-01-10T19:52:15.933	2026-01-10T18:53:45	2026-04-10T18:53:44	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R12
2025-10-07T01:27:34.328	2025-10-07T00:29:04	2026-01-05T00:29:03	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R13
2025-10-07T01:27:34.216	2025-10-07T00:29:04	2026-01-05T00:29:03	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R13
2025-07-13T16:29:03.797	2025-07-13T15:30:33	2025-10-11T15:30:32	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R10
2025-07-13T16:29:03.551	2025-07-13T15:30:33	2025-10-11T15:30:32	members.datetimeoffset.com	members.datetimeoffset.com	C=US, O=Let's Encrypt, CN=R10