Some logging programs seem to map all IW0 callsigns to Sardinia, which is incorrect.
The IW0 prefix is allocated as follows:
Callsigns in the range IW0
[A:Z][A:Z] are allocated to the region of Lazio, Italy.
Callsigns in the range IW0[Q:T][A:Z][A:Z] are allocated to the region of Umbria, Italy.
Callsigns in the range IW0[U:Z][A:Z][A:Z] are allocated to Sardinia.
For an in-depth treatment of Italian callsigns, see I0JX's Almost everything on the Italian ham-radio callsign assignment system.
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