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

Results for*.programmerbooks.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-08-14T08:01:28.196	2022-08-14T07:01:27	2022-11-12T07:01:26	programmerbooks.com	*.programmerbooks.com	C=US, O=Let's Encrypt, CN=E1
2022-08-14T08:01:28.196	2022-08-14T07:01:27	2022-11-12T07:01:26	programmerbooks.com	*.programmerbooks.com	C=US, O=Let's Encrypt, CN=E1
2022-08-14T08:01:27.976	2022-08-14T07:01:27	2022-11-12T07:01:26	programmerbooks.com	*.programmerbooks.com	C=US, O=Let's Encrypt, CN=E1
2022-08-14T08:01:27.976	2022-08-14T07:01:27	2022-11-12T07:01:26	programmerbooks.com	*.programmerbooks.com	C=US, O=Let's Encrypt, CN=E1
2021-06-09T01:17:54.064	2021-06-09T00:00:00	2022-06-09T23:59:59	programmerbooks.com	*.programmerbooks.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2021-06-09T01:17:54.064	2021-06-09T00:00:00	2022-06-09T23:59:59	programmerbooks.com	*.programmerbooks.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1