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Displays/searches for city, county, and ward numbers (JCC/JCG) used in amateur radio.

* Functions
- JCC/JCG display: Displays a list of JCC/JCG numbers in ascending order by city, county, and ward.
- Search: Incrementally searches for JCC/JCG numbers, prefecture, city, county, and ward names in kanji, hiragana, and romaji, with a first match.
- County and ward coloring: Displays each county and ward in a different color.
- Display extinct cities, counties, and wards: Displays extinct cities, counties, and wards in a different color.
- Display contest numbers: Displays the numbers used in JARL contests.
- Display Hokkaido branch office numbers: Displays Hokkaido branch office numbers.

* City, county, and ward number listThis
is based on the city, county, and ward number list published by JARL.
- JCC List as of May 1, 2019: 815 cities in existence, 98 cities that have disappeared
- JCG List as of October 1, 2018: 379 districts in existence, 243 districts that have disappeared
- Ward List as of January 1, 2024: 20 ordinance-designated cities, 171 districts, 13 districts that have disappeared

* App permission information
This app does not require permission.