I just compiled a non-abbreviated list of callsign prefixes and country names, including non-ITU allocated prefixes.
Data source is Wikipedia plus a whole bunch of post-processing work by me. It should therefore be up to date as of now.
Might be useful to people writing ham radio applications in future, e.g. me.
Should you use it, it would be nice but not necessary if you credited me, but please do credit Wikipedia.