ItalyIN3: Trentino-Alto Adige
Callsigns beginning with IN3 were issued in Trentino-Alto Adige, in Italy. No other series uses this area.
Call area
Every IN3 station counts for CQ zone 15 and ITU zone 28.
How call areas work in Italy
Italian calls carry the region in the digit: I1 Piemonte and Liguria, I2 Lombardia, I3 Veneto, I4 Emilia-Romagna, I5 Toscana, I6 Marche and Abruzzo, I7 Puglia and Basilicata, I8 Campania, Molise and Calabria, I0 Lazio and Umbria. The IK, IZ, IW, IU and IQ series follow the same digits.
The special-statute regions have prefixes of their own: IX1 Valle d'Aosta, IN3 Trentino-Alto Adige, IV3 Friuli-Venezia Giulia and IT9 Sicily, which counts as Italy for DXCC. Sardinia (IS0, IM0) is a separate entity. All of Italy is in CQ zone 15 and ITU zone 28; the area matters for national awards and in the ARI DX Contest, where Italians send their province.
Portable and moved stations
Operators away from home often add a suffix such as /P or the number of the area they are in, and many keep a IN3 call after moving. For awards the place of operation counts, so the prefix is a strong hint, not proof.