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

Results for*.s3.activecloud.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-01-21T13:57:03.597	2019-01-21T12:57:03	2019-04-21T12:57:03	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-21T13:57:03.597	2019-01-21T12:57:03	2019-04-21T12:57:03	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-21T13:57:03.12	2019-01-21T12:57:03	2019-04-21T12:57:03	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-21T13:57:03.12	2019-01-21T12:57:03	2019-04-21T12:57:03	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-24T11:12:07.814	2018-10-24T10:12:07	2019-01-22T10:12:07	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-24T11:12:07.814	2018-10-24T10:12:07	2019-01-22T10:12:07	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-24T11:12:07.132	2018-10-24T10:12:07	2019-01-22T10:12:07	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-10-24T11:12:07.132	2018-10-24T10:12:07	2019-01-22T10:12:07	*.s3.activecloud.com	*.s3.activecloud.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3