MICA web

Mode S interrogator code allocation web application

We developed a web-based application used to coordinate and manage the allocation of Interrogator Codes (ICs) in the ICAO EUR region and ICAO MID region.

Log in Access

The process applicable to the allocation of Mode S Interrogator Codes in the ICAO European region and to the interrogator code (IC) conflict management is supported by our MICA web application.


The tool allows users to:

  • submit applications in order to request an IC for a Mode S radar and
  • to retrieve the corresponding issued IC allocations.


To access the MICA web application, operational stakeholders should:

  1. Register to OneSky Online
    You can register to OneSky Online in a few minutes and this will allow you to access this and many other EUROCONTROL tools.
  2. Subscribe 
    Once you have registered, log in, and click on the 'Manage' button at the bottom right-hand side of your screen. The page which comes up will allow you to manage the tools you are subscribed to. Find the database in the list, click on it, provide a business justification for requesting access and click on 'Subscribe'.
  3. Confirmation
    Your request will be vetted and you will receive confirmation that you can now access the tool. The time this takes depends on the team in charge and the process applied. When you have received confirmation, log in to OneSky Online, click on the tool in your list of services and enjoy.

Register to OneSky Online


If you are experiencing issues with accessing or using the tool, please contact us by using our page's contact form.