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

Results forrbsii.ocsptn.identrust.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-12-03T08:21:21.215	2019-10-25T17:15:29	2021-10-24T17:15:29	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2019-11-03T09:34:26.568	2019-10-25T17:15:55	2021-10-24T17:15:55	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2019-11-03T09:34:26.469	2019-10-25T17:14:56	2021-10-24T17:14:56	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2019-10-25T17:15:55.438	2019-10-25T17:15:55	2021-10-24T17:15:55	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2019-10-25T17:15:29.834	2019-10-25T17:15:29	2021-10-24T17:15:29	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2019-10-25T17:14:56.977	2019-10-25T17:14:56	2021-10-24T17:14:56	rbsii.ocsptn.identrust.com	rbsii.ocsptn.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52