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

Results for*.knowledgebay.net

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-02-26T01:45:52.634	2019-02-23T00:00:00	2020-02-23T12:00:00	sni.cloudflaressl.com	*.knowledgebay.net	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-26T01:45:52.634	2019-02-23T00:00:00	2020-02-23T12:00:00	sni.cloudflaressl.com	*.knowledgebay.net	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-23T12:59:43.588	2019-02-23T00:00:00	2020-02-23T12:00:00	sni.cloudflaressl.com	*.knowledgebay.net	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-02-23T12:59:43.588	2019-02-23T00:00:00	2020-02-23T12:00:00	sni.cloudflaressl.com	*.knowledgebay.net	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2