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

Results for*.qstrings.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-06-03T02:04:08.491	2019-06-03T01:04:07	2019-09-01T01:04:07	qstrings.com	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-03T02:04:08.491	2019-06-03T01:04:07	2019-09-01T01:04:07	qstrings.com	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-03T02:04:07.652	2019-06-03T01:04:07	2019-09-01T01:04:07	qstrings.com	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-03T02:04:07.652	2019-06-03T01:04:07	2019-09-01T01:04:07	qstrings.com	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-13T05:37:00.109	2019-03-13T04:36:59	2019-06-11T04:36:59	madisonromania.org	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-13T05:37:00.109	2019-03-13T04:36:59	2019-06-11T04:36:59	madisonromania.org	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-13T05:36:59.53	2019-03-13T04:36:59	2019-06-11T04:36:59	madisonromania.org	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-13T05:36:59.53	2019-03-13T04:36:59	2019-06-11T04:36:59	madisonromania.org	*.qstrings.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3