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

Results for*.astu.co

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2024-03-24T05:08:10.081	2024-03-24T00:00:00	2025-04-08T23:59:59	*.astu.co	*.astu.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2
2024-03-24T05:08:10.081	2024-03-24T00:00:00	2025-04-08T23:59:59	*.astu.co	*.astu.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2
2023-04-07T07:46:04.836	2023-04-07T00:00:00	2024-04-06T23:59:59	*.astu.co	*.astu.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2
2023-04-07T07:46:04.836	2023-04-07T00:00:00	2024-04-06T23:59:59	*.astu.co	*.astu.co	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G2