Passpoint® requires ANQP to supply three information elements from the Access Point.
Public Land Mobile Network Id is defined by 3GPP and comprised of two, three digit numbers to uniquely identify the Mobile Network Operator (MNO).
A Fully Qualified Domain Name (FQDN) is a realm representing the service provider of the Wi-Fi service. Non MNO operators are an example of 'realm-based' service advertisements. Examples include Cable MSOs, Enterprises or other on MNO providers. Authentication methods used with realm-based configuration are EAP-TLS and EAP-TTLS.
OI / RCOI
Organization Id or as defined by Wireless Broadband Alliance, Roaming Consortium Organization Id indicate the federated identity capable of authentication. Examples would be OpenRoaming, Eduroam and follow the Passpoint® EAP authentication methods.