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

Results for*.thatknowledge.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-07-25T22:46:19.344	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-07-25T22:46:19.344	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-07-13T14:59:03.726	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-07-13T14:59:03.726	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2019-08-17T17:04:00.194	2019-08-14T00:00:00	2020-08-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-17T17:04:00.194	2019-08-14T00:00:00	2020-08-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-14T08:46:21.788	2019-08-14T00:00:00	2020-08-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-08-14T08:46:21.788	2019-08-14T00:00:00	2020-08-13T12:00:00	sni.cloudflaressl.com	*.thatknowledge.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2