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

Results forautoconfig.slack.computer

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2024-12-02T04:34:59.658	2024-12-02T03:36:28	2025-03-02T03:36:27	www.autoconfig.slack.computer	www.autoconfig.slack.computer	C=US, O=Let's Encrypt, CN=R10
2024-12-02T04:34:59.236	2024-12-02T03:36:28	2025-03-02T03:36:27	www.autoconfig.slack.computer	www.autoconfig.slack.computer	C=US, O=Let's Encrypt, CN=R10
2024-12-01T07:54:05.6	2024-12-01T06:55:33	2025-03-01T06:55:32	autoconfig.slack.computer	autoconfig.slack.computer	C=US, O=Let's Encrypt, CN=R10
2024-12-01T07:54:03.347	2024-12-01T06:55:33	2025-03-01T06:55:32	autoconfig.slack.computer	autoconfig.slack.computer	C=US, O=Let's Encrypt, CN=R10