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

Results forhostmaster.securitysystemmonitoring.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-11-19T07:25:41.915	2025-11-19T06:27:09	2026-02-17T06:27:08	hostmaster.securitysystemmonitoring.com	hostmaster.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R12
2025-11-19T07:25:39.693	2025-11-19T06:27:09	2026-02-17T06:27:08	hostmaster.securitysystemmonitoring.com	hostmaster.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R12
2023-01-17T18:10:28.692	2023-01-17T17:10:28	2023-04-17T17:10:27	securitysystemmonitoring.com	*.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R3
2023-01-17T18:10:28.483	2023-01-17T17:10:28	2023-04-17T17:10:27	securitysystemmonitoring.com	*.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:08:29.453	2022-11-18T15:08:29	2023-02-16T15:08:28	securitysystemmonitoring.com	*.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R3
2022-11-18T16:08:29.198	2022-11-18T15:08:29	2023-02-16T15:08:28	securitysystemmonitoring.com	*.securitysystemmonitoring.com	C=US, O=Let's Encrypt, CN=R3