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

Results formx.mx.cryptoned.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2024-05-08T12:31:30.734	2024-05-08T11:31:30	2024-08-06T11:31:29	mx.mx.cryptoned.com	mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3
2024-05-08T12:31:30.623	2024-05-08T11:31:30	2024-08-06T11:31:29	mx.mx.cryptoned.com	mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3
2024-05-08T11:43:55.851	2024-05-08T10:43:55	2024-08-06T10:43:54	mx.mx.mx.cryptoned.com	mx.mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3
2024-05-08T11:43:55.745	2024-05-08T10:43:55	2024-08-06T10:43:54	mx.mx.mx.cryptoned.com	mx.mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3
2024-05-08T10:31:40.337	2024-05-08T09:31:40	2024-08-06T09:31:39	mx.mx.mx.mx.mx.cryptoned.com	mx.mx.mx.mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3
2024-05-08T10:31:40.244	2024-05-08T09:31:40	2024-08-06T09:31:39	mx.mx.mx.mx.mx.cryptoned.com	mx.mx.mx.mx.mx.cryptoned.com	C=US, O=Let's Encrypt, CN=R3