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

Results forperantiguru.com.renderproxy.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-01-31T21:25:33.137	2020-01-31T20:25:32	2020-04-30T20:25:32	www.perantiguru.com.renderproxy.com	www.perantiguru.com.renderproxy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-31T21:25:33.005	2020-01-31T20:25:32	2020-04-30T20:25:32	www.perantiguru.com.renderproxy.com	www.perantiguru.com.renderproxy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-31T21:22:25.093	2020-01-31T20:22:24	2020-04-30T20:22:24	perantiguru.com.renderproxy.com	perantiguru.com.renderproxy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-31T21:22:24.939	2020-01-31T20:22:24	2020-04-30T20:22:24	perantiguru.com.renderproxy.com	perantiguru.com.renderproxy.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3