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

Results for*.smtp.mdlabtests.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-12-16T04:11:59.8	2025-12-16T03:13:29	2026-03-16T03:13:28	rogtoto.live	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R13
2025-12-16T04:11:59.8	2025-12-16T03:13:29	2026-03-16T03:13:28	rogtoto.live	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R13
2025-12-16T04:11:59.405	2025-12-16T03:13:29	2026-03-16T03:13:28	rogtoto.live	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R13
2025-12-16T04:11:59.405	2025-12-16T03:13:29	2026-03-16T03:13:28	rogtoto.live	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R13
2025-10-17T04:11:46.838	2025-10-17T03:13:16	2026-01-15T03:13:15	s2a.us	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R12
2025-10-17T04:11:46.838	2025-10-17T03:13:16	2026-01-15T03:13:15	s2a.us	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R12
2025-10-17T04:11:46.488	2025-10-17T03:13:16	2026-01-15T03:13:15	s2a.us	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R12
2025-10-17T04:11:46.488	2025-10-17T03:13:16	2026-01-15T03:13:15	s2a.us	*.smtp.mdlabtests.com	C=US, O=Let's Encrypt, CN=R12