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

Results for*.halimlab.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-08-28T14:44:02.252	2019-08-26T00:00:00	2020-08-25T12:00:00	sni.cloudflaressl.com	*.halimlab.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-28T14:44:02.252	2019-08-26T00:00:00	2020-08-25T12:00:00	sni.cloudflaressl.com	*.halimlab.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-26T20:39:35.993	2019-08-26T00:00:00	2020-08-25T12:00:00	sni.cloudflaressl.com	*.halimlab.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-26T20:39:35.993	2019-08-26T00:00:00	2020-08-25T12:00:00	sni.cloudflaressl.com	*.halimlab.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2