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

Results fordefault.arp.identrust.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-09-23T21:20:22.661	2025-09-23T21:20:22	2026-09-23T21:19:22	default.arp.identrust.com	default.arp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA O1
2025-08-19T19:31:52.21	2024-09-20T19:26:51	2025-09-20T19:25:51	default.arp.identrust.com	default.arp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA O1
2024-09-20T19:26:51.625	2024-09-20T19:26:51	2025-09-20T19:25:51	default.arp.identrust.com	default.arp.identrust.com	C=US, O=IdenTrust, OU=TrustID Server, CN=TrustID Server CA O1