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

Results for*.simpmessenger.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-07-13T09:30:40.776	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.simpmessenger.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-07-13T09:30:40.776	2020-07-13T00:00:00	2021-07-13T12:00:00	sni.cloudflaressl.com	*.simpmessenger.com	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2019-10-19T21:44:03.031	2019-10-19T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.simpmessenger.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-10-19T21:44:03.031	2019-10-19T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.simpmessenger.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2