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

Results forhostmaster.pdf.cool

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-10-11T10:01:37.041	2025-10-11T09:03:06	2026-01-09T09:03:05	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R12
2025-10-11T10:01:36.823	2025-10-11T09:03:06	2026-01-09T09:03:05	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R12
2025-08-12T09:01:41.069	2025-08-12T08:03:09	2025-11-10T08:03:08	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R11
2025-08-12T09:01:39.954	2025-08-12T08:03:09	2025-11-10T08:03:08	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R11
2025-06-13T08:42:30.289	2025-06-13T07:43:57	2025-09-11T07:43:56	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R10
2025-06-13T08:42:28.086	2025-06-13T07:43:57	2025-09-11T07:43:56	pdf.cool	*.pdf.cool	C=US, O=Let's Encrypt, CN=R10