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

Results forcache.dev.mapworks.io

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-12-24T01:58:30.223	2019-12-24T00:00:00	2021-01-24T12:00:00	cache.dev.mapworks.io	cache.dev.mapworks.io	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-01-21T01:43:07.483	2019-01-21T00:00:00	2020-02-21T12:00:00	cache.dev.mapworks.io	cache.dev.mapworks.io	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2016-04-20T12:51:00.042	2016-04-18T00:00:00	2019-04-24T23:59:59	*.dev.mapworks.io	*.dev.mapworks.io	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA
2015-06-21T16:08:54.384	2015-04-17T00:00:00	2016-04-16T23:59:59	*.dev.mapworks.io	*.dev.mapworks.io	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA