The OGN APRS servers form the backbone of the OGN infrastructure tier. By clicking on the following links you can see all OGN receivers presently connected to the selected server.
The servers run the APRSC software, which receives all messages from the different OGN receivers and relay this information on request to the client tier. Due to load balancing and better redundancy in case of a failure there are currently three servers. They constantly exchange all received messages in order to keep the available data consistent. OGN APRS servers cache packets in memory (for few seconds) to prevent duplicates.
For more information about the APRS server software please visit following link.
Also see OGN infrastructure details.