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

Results for*.learningtree.ai

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-12-14T10:29:34.857	2020-12-14T00:00:00	2022-01-14T23:59:59	*.learningtree.ai	*.learningtree.ai	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-12-14T10:29:34.857	2020-12-14T00:00:00	2022-01-14T23:59:59	*.learningtree.ai	*.learningtree.ai	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-12-14T10:29:34.562	2020-12-14T00:00:00	2022-01-14T23:59:59	*.learningtree.ai	*.learningtree.ai	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
2020-12-14T10:29:34.562	2020-12-14T00:00:00	2022-01-14T23:59:59	*.learningtree.ai	*.learningtree.ai	C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA