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

Results for*.keymaker.host

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-08-11T13:22:08.259	2020-08-11T00:00:00	2021-08-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-08-11T13:22:08.259	2020-08-11T00:00:00	2021-08-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2019-09-14T20:20:23.483	2019-09-12T00:00:00	2020-09-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-14T20:20:23.483	2019-09-12T00:00:00	2020-09-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-12T18:20:17.513	2019-09-12T00:00:00	2020-09-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-09-12T18:20:17.513	2019-09-12T00:00:00	2020-09-11T12:00:00	sni.cloudflaressl.com	*.keymaker.host	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2