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

Results for*.postagram.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-01-12T00:33:55.627	2021-01-11T23:33:55	2021-04-11T23:33:55	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=R3
2021-01-12T00:33:55.627	2021-01-11T23:33:55	2021-04-11T23:33:55	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=R3
2021-01-12T00:33:55.223	2021-01-11T23:33:55	2021-04-11T23:33:55	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=R3
2021-01-12T00:33:55.223	2021-01-11T23:33:55	2021-04-11T23:33:55	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=R3
2020-10-30T14:13:30.668	2020-10-30T13:13:30	2021-01-28T13:13:30	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-30T14:13:30.668	2020-10-30T13:13:30	2021-01-28T13:13:30	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-30T14:13:30.442	2020-10-30T13:13:30	2021-01-28T13:13:30	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-30T14:13:30.442	2020-10-30T13:13:30	2021-01-28T13:13:30	postagram.com	*.postagram.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3