These documents are here to help developers of RadioDNS Hybrid Radio systems and receiver implementations

On this page you’ll find the current (and prior) versions of our specifications, proposals for new specifications, HOWTO guides with step-by-step information, and technical case-studies/presentations.

Current Versions

These are the latest versions of all our published standards. Use these versions when you’re developing anything new. They are free to download and use.

Core Lookup

You need the core lookup specification to create a DNS lookup to find the FQDN (Fully Qualified Domain Name) for a radio station, so you can make an IP connection.


The use of ISO Country Codes in DNS lookups has been deprecated from v1.1.1 of the Hybrid lookup specification. All DNS lookups for FM or DAB are required to provide the ECC code. ECC is an optionally transmitted parameter.

Receiver implementers are strongly recommended to implement the process to determine an ECC code from geo-location information, and a code library is provided to support that.


Applications provide specific functionality.


We have become aware that a significant number of (smartphone) receivers are still using the v1.1 version of the Service and Programme Information (formerly RadioEPG) specification. We strongly recommend that Service Providers / Broadcasters provide both the SI.xml file defined in v3.1.1 and the XSI.xm file defined in v1.1. The SI tool now produces output in both v3.1.1 and v1.1 outputs, in a ZIP file, and there are set of XSL-T transforms to move between SI<->XSI formats in the RadioDNS Github repository.

Prior Versions

You shouldn’t use these documents any more, except for historic reference.

Proposed Standards

These documents are work in progress of new applications being worked on by Working Teams. They’re unstable, liable to change, and here for information only.


We have a collection of HOWTO documents, which are step-by-step guides to implementing RadioDNS Hybrid Radio functionality.

Technical Presentations

A collection of presentations from technical conferences explaining how to manage RadioDNS Hybrid Radio application systems.


If you need technical support, please post your question on the relevant Discussion Board, or email