Let’s talk about the IDX IDX or Internet Data Exchange is why you and I are able to browse MLS listings online. More specifically, IDX is the set of rules, licenses, and technologies that allow real estate agents to access MLS listings, integrate them on their websites, and display them publically. “ href=”https://realtyna.com/glossary/idx/” target=”_blank” data-gt-translate-attributes=’[{“attribute”:”data-cmtooltip”, “format”:”html”}]’ tabindex=’0’ role=’link’>IDX elephant in the room.