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

Results forhostmaster.cryptographyalgorithm.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2024-03-18T14:33:00.317	2024-03-18T13:33:00	2024-06-16T13:32:59	cryptographyalgorithm.com	*.cryptographyalgorithm.com	C=US, O=Let's Encrypt, CN=E1
2024-03-18T14:33:00.198	2024-03-18T13:33:00	2024-06-16T13:32:59	cryptographyalgorithm.com	*.cryptographyalgorithm.com	C=US, O=Let's Encrypt, CN=E1
2023-12-19T08:52:07.897	2023-12-19T07:52:07	2024-03-18T07:52:06	cryptographyalgorithm.com	*.cryptographyalgorithm.com	C=US, O=Let's Encrypt, CN=E1
2023-12-19T08:52:07.62	2023-12-19T07:52:07	2024-03-18T07:52:06	cryptographyalgorithm.com	*.cryptographyalgorithm.com	C=US, O=Let's Encrypt, CN=E1