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

Results forpostmaster.darkz.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-08T23:40:30.449	2025-11-08T22:41:59	2026-02-06T22:41:58	postmaster.darkz.com	postmaster.darkz.com	C=US, O=Let's Encrypt, CN=R13
2025-11-08T23:40:30.072	2025-11-08T22:41:59	2026-02-06T22:41:58	postmaster.darkz.com	postmaster.darkz.com	C=US, O=Let's Encrypt, CN=R13
2023-01-17T17:22:21.003	2023-01-17T16:22:20	2023-04-17T16:22:19	darkz.com	*.darkz.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T17:22:20.906	2023-01-17T16:22:20	2023-04-17T16:22:19	darkz.com	*.darkz.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T15:23:01.926	2022-11-18T14:23:01	2023-02-16T14:23:00	darkz.com	*.darkz.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T15:23:01.749	2022-11-18T14:23:01	2023-02-16T14:23:00	darkz.com	*.darkz.com	C=US, O=Let's Encrypt, CN=R3