Unique Organization Identifier (UOI)

RESO’s Unique Organization Identifier (UOI) provides a singular ID for a growing list of individual organizations within the real estate industry. The list includes REALTOR® associations, MLSs, technology vendors, brokers and other affiliated businesses.

For example, from the UOI, you can derive how many MLSs there are in North America.

Data providers should include their UOI in data feeds so data recipients can accurately identify the organizational source (publisher) of each piece of data in an aggregated database.

Technology partners utilizing data should use the UOI to assist with the management of multiple data feeds and overlapping service areas. This helps with clear notation of data originators and allows for easier data deduplication.

Technology partners can also use a UOI to look up association-to-MLS relationships, which can be helpful when an association provides a lockbox or showing service, but the underlying data is from an MLS source that must be linked to the association’s system.

The RESO Data Dictionary includes standardized containers for the UOI (still documented as OUID at this time).

Orgs and Endorsements Service

A JSON-based Orgs and Endorsements Service, which uses the OUID Resource schema, has replaced the RESO UOI API (formerly known as the RESO OUID API).

Queries can be performed by organization type such as:

• https://services.reso.org/orgs?orgTypes=MLS
• https://services.reso.org/orgs?orgTypes=Local%20Association
• https://services.reso.org/orgs?orgTypes=Brokerage

A comma-separated list is also acceptable: https://services.reso.org/orgs?orgTypes=MLS,Brokerage

RESO endorsements can be viewed by adding a parameter to the request: https://services.reso.org/orgs?showEndorsements=true

If you have further questions about the Orgs and Endorsement Service, please contact dev@reso.org.

If you have suggested changes to the organizations themselves, please contact support@reso.org.

In addition to the Orgs and Endorsement Service,  RESO manages a robust UOI Production Service. Both services can also be found under the RESO Certification & MLS Map with accompanying information.

Acknowledgements

The RESO UOI is the product of a synergetic effort from industry professionals who offered their time, vision and expertise towards the formation of this project. We are thankful for the contributions of Matt Cohen, Ross Colley, Bill Kellogg, Greg Sax, Rick Sherwood, Clint Skutchan and Allen Wright.