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

Results for*.queue.ams01.hostcontrol.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-12-20T02:13:59.353	2017-09-12T00:00:00	2020-09-11T23:59:59	*.queue.ams01.hostcontrol.com	*.queue.ams01.hostcontrol.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA
2018-12-20T02:13:59.353	2017-09-12T00:00:00	2020-09-11T23:59:59	*.queue.ams01.hostcontrol.com	*.queue.ams01.hostcontrol.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA
2018-01-16T21:30:38.965	2017-11-28T00:00:00	2018-11-28T23:59:59	portal.ams01.hostcontrol.com	*.queue.ams01.hostcontrol.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA
2018-01-16T21:30:38.965	2017-11-28T00:00:00	2018-11-28T23:59:59	portal.ams01.hostcontrol.com	*.queue.ams01.hostcontrol.com	C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA