Finding Radio Station Logos

A step-by-step guide to finding station logos using RadioDNS

Step 1

Start with the broadcast information of a radio station.

In this example, we use Heart in London, UK.

frequency = 106.2MHz
PI code = C460
ECC code for the United Kingdom = E1
(You can find a list of countries and their ECC codes in TS 101 756. Some common ones are Germany “e0” and the USA “a0”)

Step 2

Convert this information into the RadioDNS format

Convert frequency: 106.2MHz => 10620
Convert PI code: C460 => c460
Create a GCC by combining the first letter of the PI (“C”) code and the country ECC code (“E1”) => ce1

Make a RadioDNS FQDN by stringing these details together

Step 3

Do a DNS lookup on these details to find the broadcaster’s Fully Qualified Domain Name (FQDN).

From Microsoft Windows, MacOS or Linux, open a command window and type:

nslookup -type=CNAME

Look at the response from the command, and you should see a line which says  canonical name =

Step 4

Find the broadcaster’s metadata server.

Using the broadcaster’s FQDN, use DNS again to find the server with their metadata

nslookup -type=SRV

In the response, you should see one (or more) entries that say      service = 0 100 80

So you need to connect to get the SI (Service Information) file from this broadcaster.

Step 5

Download the broadcaster’s SI file.

The SI file contains all the metadata for that broadcaster (all their radio stations). The URL to the SI file is always constructed as

http://<broadcaster metadata server>/radiodns/spi/3.1/SI.xml

So open a browser to:

Save this file to disk.

Step 6

Find the radio station in the broadcaster’s SI file.

Open the SI.xml file in a text editor / XML editor, or similar. We need to search for the station in the format of a bearer. This is a similar format to the RadioDNS FQDN at Step 2.

fm:<gcc>.<pi code>.<frequency>

So the correct bearer string will be


Search the text file to find this string – “fm:ce1.c460.10620”. The text around it will look this like

<longName>Heart London</longName>
<multimedia height="32" url="" width="32" mimeValue="image/png"/>
<multimedia height="32" url="" width="112" mimeValue="image/png"/>
<multimedia height="128" url="" width="128" mimeValue="image/png"/>
<multimedia height="240" url="" width="320" mimeValue="image/jpg"/>
<multimedia height="600" url="" width="600" mimeValue="image/jpg"/>
<multimedia height="800" url="" width="800" mimeValue="image/jpg"/>
<bearer cost="30" id="fm:ce1.c460.10620"/>
<bearer cost="20" id="dab:ce1.c185.c460.0" mime="audio/mpeg" offset="2500"/>
<radiodns fqdn="" serviceIdentifier="london"/>
<memberOf id="heart"/>

Step 7

Find the URL to the radio station logos.

The <bearer> element you found will live within a <service> element, which defines the service. Within this you’ll see a series of mediaDescription items like this

<multimedia height="600" url="" width="600" mimeValue="image/jpg"/>

Each mediaDescription item refers to a specific logo size or dimension.

Step 8

Download the radio station logo.

Use the URL in the mediaDescription item to open the logo in a browser.


This process is identical for all radio stations using RadioDNS. Try working this example again, but for a German radio station on DAB.

Bayern 3
Service Component ID : 0
Service ID: D313
Ensemble ID: 10A5

The structure of a DAB RadioDNS FQDN IS:

<service component id>.<service id>.<ensemble id>.<gcc>

So your FQDN query will be:

The bearer structure is similarly altered

dab:<gcc>.<ensemble id>.<service id>.<service component id>

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