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

Results forecobank-arptest.otp.identrust.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-08-04T04:27:46.75	2018-07-25T22:49:23	2020-07-24T22:49:23	ecobank-arptest.otp.identrust.com	ecobank-arptest.otp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2018-07-25T22:49:24.267	2018-07-25T22:49:23	2020-07-24T22:49:23	ecobank-arptest.otp.identrust.com	ecobank-arptest.otp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52
2017-07-31T05:40:43.497	2015-08-12T19:36:22	2018-08-11T19:36:22	ecobank-arptest.otp.identrust.com	ecobank-arptest.otp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA A52