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

Results for*.nakpun.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-10-14T15:46:58.147	2019-10-14T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.nakpun.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-10-14T15:46:58.147	2019-10-14T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.nakpun.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-11-14T07:08:00.556	2018-11-14T00:00:00	2019-11-14T12:00:00	sni.cloudflaressl.com	*.nakpun.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2018-11-14T07:08:00.556	2018-11-14T00:00:00	2019-11-14T12:00:00	sni.cloudflaressl.com	*.nakpun.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2