Hi Moffrestorer,
I happened to use the long list but the short list should give the same result (from the diagnostic page :8081). I simply 'select all' in the browser and copy and paste the results into Excel, and expand out with Data and Text-to-Columns. It's crude but quick. A simple sort of the list will aggregate all lines with identifier codes in one block. As to what exactly is recorded will be for others to advise us. It appears to be just Flarm and OGN devices (not sure about PAW). I understand that some FLARM devices can be coded with the plane's ICAO number so that typically the Benson training fleet of Grobs show ICAO ID codes.
You are right that other aircraft do not appear to be recorded here. Other aircraft transiting with ADS-B, Mode C/S, military aircraft; police helicopters and others with no identifiers are all missing - however the number of these is relatively small compared to the very significant number of gliders on some days. I also run a PAW as a ground station so the traffic logs I've saved may contain the combined data of PAW + OGN-R. The format of the PAW.trk files looks messy and I haven't looked at decoding them.
The aircraft identifiers in the RTLSDR-OGN logfile are prefixed with the following 3-letter codes which I believe refer to :-
FLR is Flarm with identities typically starting DDxxxx
ICA is devices programmed with the ICAO identifier which can be translated to the registration (as shown on
http://glidertracker.org, PAW and can be looked up on the ginfo site at
https://siteapps.caa.co.uk/g-info/ for UK regies).
OGN Open Glider Network device
RND Random?? The small number of contacts with these identifiers tend to appear to be in very far off and unbelievable locations so I cannot account for their origin.
Hope this helps.
Chris