Prefix


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  1. Issued Prefixes
  2. International Allocation — Currently JA-JS, 7J-7N and 8J-8N

    ITU (ex. International Radiotelegraphic Conference) allocated the following interenational call sign series to Japan:

    From Amateurs' View Point

    JB and JC have never been used. These are reserved to prepare for unexpected situations in our future, the JARL said. But, the original reasons are the follows:

    JD is reserved for Ogasawara. Only JD1 exists, no other numbers.
    8K and 8L have never been used, either.
    8M appeared only twice for special events:
    as 8M2000 (two thousand), one of the three 2000 AD commemoration stations, and
    as 8M1C, one of the ten FIFA World Cup stations.

    Issued Prefixes, and the Years (for Individuals)
    Where, 
    YELLOW: District 1 Mainland
    BLUE: Ogasawara
    PURPLE: Both District 1 Mainland and Ogasawara
    GREEN: Okinawa

      1 2 3 4 5 6 7 8 9 0
    JA 1952-1966
    2003-2004
    1952-1970 1952-1969 1952-1973 1952-1976 1952-1971
    1999-2006
    1952-1973 1952-1975 1954-1979 1954-1975
    JB                    
    JC                    
    JD 1969-NOW                  
    JE 1971-1972
    1985-1986
    2004-2007
    1975-1978
    1992-1993
    1974-1975
    1991
    1981-1984 1986-1989 1978-1981
    2006-NOW
    1981-1983 1984-1987 1991-1995 1986-1989
    JF 1972-1973
    1986
    2007-2009
    1978-1980
    1993
    1975-1978
    1991-1992
    1984-1987 1989-1991 1981-1983 1983-1985 1987-1989 1995-NOW 1989-1991
    JG 1973-1974
    1986-1987
    2009-2011
    1980-1982
    1993
    1978-1980
    1992
    1987-1988 1991-1994 1983-1985 1985-1987 1989-1991   1991-1994
    JH 1966-1969
    1987
    2011-2013
    1970-1973
    1993-1994
    1969-1972
    1992-1993
    1973-1977 1976-1983 1971-1976 1973-1977 1975-1980 1979-1987 1975-1982
    JI 1974-1976
    1987-1988
    2013-2016
    1982-1984
    1994-1995
    1980-1981
    1993-1994
    1988-1990 1994-2000 1985-1987 1987-1989 1991-1993   1994-1997
    JJ 1976-1977
    1988
    2016-NOW
    1984-1985
    1995
    1981-1982
    1994
    1990-1991 2000-NOW 1987-1988 1989-1991 1993-1995   1997-NOW
    JK 1977-1978
    1988-1989
    1985-1987
    1995
    1982-1983
    1994-1995
    1991-1993   1988-1989 1991-1992 1995-2000    
    JL 1978-1979
    1989
    1987-1988
    1995-1996
    1983-1984
    1995-1996
    1993-1994   1989-1990 1992-1994 2000-2010    
    JM 1979-1980
    1989
    1988-1989
    1996
    1984-1985
    1996-1998
    1994-1996   1990-1992 1994-1996 2010-NOW    
    JN 1980-1981
    1989
    1989-1990
    1996-1997
    1985-1987
    1998-2002
    1996-2007   1992-1993 1996-1999      
    JO 1981-1982
    1989
    1990
    1997-1998
    1987-1988
    2002-2011
    2007-NOW   1993-1994 1999-2009      
    JP 1982-1983
    1989
    1990-1991
    1998-2001
    1988-1989
    2011-NOW
    Repeater Repeater 1994-1996 2009-NOW Repeater Repeater Repeater
    JQ 1983-1984
    1989-1990
    1991-1992
    2001-2007
    1989-1990     1996-1999        
    JR 1969-1971
    1990
    1973-1975
    2007-2015
    1972-1974 1977-1981 1983-1986 AA-:
    1972
    1977-1981 1980-1984 1987-1991 1982-1986
    AAA-:
    1976-1978
    QUA-:
    1972-1983
    JS 1984-1985
    1990
    1992
    2015-NOW
    1990-1991     1983-NOW        
      1 2 3 4 5 6 7 8 9 0
    7J 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999 1985-1999
    7K 1990 1991-1992 1993 1995-1996            
    7L 1990-1991 1992 1993-1994 1996-1997            
    7M 1991 1992-1993 1994 1997-1999            
    7N 1991 1993 1994-1995 1999-2003            
      1 2 3 4 5 6 7 8 9 0
    8J Special Special Special Special Special Special Special Special Special Special
    8K                    
    8L                    
    8M (8M1C) (8M2000)                
    8N Special Special Special Special Special Special Special Special Special Special

  3. Assigned Order
  4. The Japanese call signs have been assigned in the following order post war.

  5. Call Sign Shortage of Japan
  6. Call sign shortage of Japan was due to the increasing number of amateurs especially from 1980s to 1990s. This first occurred in Area 1 (Tokyo, Yokohama), followed by Area 3 (Osaka, Kyoto, Kobe), Area 2 (Nagoya) and Area 6 (Kyushu mainland).


    Transition of Total Number of Amateur Stations in JA


    Increment of the Lowest Class Operator Licensees — Telephone Class (1958-1990) or 4th Class (since 1990)

    1ST STAGE — Recycle


    Consumption of Prefixes in Area 1

    2ND STAGE — 7K1-7N1

    3RD STAGE — 7K2-7N4

    4TH STAGE — Recycle, again

    "JA" Recycle Opened

  7. Special Rules for Okinawa — Two Parts of JR6 and All of JS6
  8. Formerly known as Ryukyu Islands (KR6 for Americans, and KR8 for the Japanese), Okinawa is a semi-tropical island group located in the south-west of Japan. It is now one of 47 prefectures of Japan since May 15, 1972. US hams in military bases may use the KA6 prefix as AMRS (Auxiliary Military Radio Station), but we are not allowed to communicate with them.

    Assigned Order

    Call signs (for individuals) have been assigned in the following order:

    JR6AAA-QQZ — NOT Okinawa

    One confusing fact. JR6AAA-QQZ are not Okinawa. They had been assigned for other Area 6 (Kyushu mainland). In contrast, all JS6 call signs are Okinawa. In other call areas except Area 6, JS# prefixes have no special geographical meaning. As JS is the last prefix to be assigned in J-series, we only have JS1, JS2, JS3 and JS6 call signs at this moment.

    Exception — What happened for the JR6 JS6 licensees who moved between Okinawa and Kyushu Mainland
    A licensee who moved between Okinawa and the Kyushu mainland with his/her JR6 call sign maintains his/her original one.

    Moved JR6 JS6 Licensees
    Buro  \  Block JR6AAA-QQZ JR6QUA-ZZZ
    JS6AAA-ZZZ
    Kyushu Mainland Allocated Used Exceptionally as:
    JR6RVK in Miyazaki-city
    JS6IPG in Yoshinogari-town, Kanzaki-gun
    Okinawa Used Exceptionally as:
    JR6IXZ in Nago-city,
    ex-JR6MWZ in Shimajiri-gun
    Allocated

    Club Stations in the US Age — KR8YAA-YAU

    Club stations are permitted on March 13, 1970, and first licensed as KR8YAA on May 9, 1970. These stations changed their call signs from KR8YAA-YAU to JR6YAA-YAU.

  9. Special Rules for Ogasawara — All of JD1
  10. Ogasawara is a semi-tropical small island group located about 600 miles south of Tokyo, but it is one of the parts of the Metropolis (or Prefecture) of Tokyo (i.e. Area 1). Special prefix JD1 is assigned for here in 1969, to keep status as a separated country (now "entity") even after the handover from the US in 1968.


    Breach of DXCC Criteria

    JD1AAA-XZZ is allocated for individuals, JD1YAA-ZZZ for clubs.

    In the argument on a call area, "Ogasawara" consists of (1) strictly defined Ogasawara Is., (2) Kazan (or Iwo) Is., (3) Okino-torishima I. and (4) Minami-torishima I.
    Hierarchical Geographic Relations in the Broad Sense "Ogasawara" (JD1 Area)
    Administrative
    District
    Prefix Islands DXCC Country/Entity JCG# IOTA#
    - May 29, 1976
     
    May 30, 1976
    - Nov. 30, 1980

    Dec. 1, 1980 -
    Ogasawara-vil,
    Tokyo-pref.
    JD1 Nishinoshima I. JD1(/O) JD1(/O) JD1(/O) 10007 AS-031
    Ogasawara Is. aka
    Bonin Is.
    Mukojima Is.
    Chichijima Is.
    Hahajima Is.
    Kazan Is. aka
    Iwo Is. and
    Volcano Is.
    AS-030
    Okino-torishima I. aka
    Douglas Reef and
    Parece Vera
    7J1 ex AS-052
    (- Feb. 1, 2001)
    Minami-torishima I. aka
    Marcus I.
    JD1(/M) OC-073
    In some categorizations, Kazan Is. is included in Ogasawara Is.

  11. Prefix Ranking
  12. The following table shows a ranking of prefixes as of Dec. 19, 2015, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club Stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 14975 JH1                   15089  
    2 13351   JR2                 13473 13502
    3 11791 JI1                   11877  
    4 11184 JG1                   11251  
    5 9680     JP3                 9819
    6 9573           JE6         9633  
    7 9523 JF1                   9593  
    8 9141               JL8        
    9 8838             JP7         8884
    10 8670 JA1                   8911  
    11 7854 JE1                   7945  
    12 7799             JO7          
    13 7641     JO3                  
    14 6737           JA6         6892  
    15 5564         JJ5              
    16 5561               JM8        
    17 5370   JQ2                    
    18 5062                   JJ0    
    19 4436               JK8        
    20 4081       JN4                
    21 4017       JO4                
    22 3749   JA2                 3969  
    23 3614                 JF9      
    24 3530     JN3                  
    25 3388 JR1                   3508 3543
    26 3307 JJ1                   3403  
    27 3223     JA3               3396  
    28 3193 JK1                   3310  
    29 3125             JN7          
    30 3064 JN1                   3175  
    31 3056 JP1                     3214
    32 3044   JH2                 3150  
    33 3034 JO1                   3264  
    34 2929             JA7       3103  
    35 2921 JL1                   3022  
    36 2895 7N4                      
    37 2874   JE2                 2976  
    38 2870 JM1                   2978  
    39 2861   JP2                   2991
    40 2823   JI2                 3071  
    41 2774   JF2                 2881  
    42 2771               JJ8        
    43 2766   JG2                 2858  
    44 2701       JA4             2832  
    45 2682 JQ1                   3422  
    46 2631               JI8        
    47 2628     JH3               2703  
    48 2610               JA8     2778  
    49 2541                   JA0 2654  
    50 2488     JM3                  
    51 2484   JM2                    
    52 2427   JL2                    
    53 2382     JJ3               2450  
    54 2376         JA5           2488  
    55 2370     JG3               2429  
    56 2362     JI3               2435  
    57 2361               JF8        
    58 2348         JI5              
    59 2348           JQ6           2349
    60 2345   JJ2                 2651  
    61 2340   JO2                    
    62 2311   JN2                    
    63 2306     JE3               2376  
    64 2303               JR8     2455 2476
    65 2291   JK2                    
    66 2282     JF3               2366  
    67 2281                 JA9   2403  
    68 2273 JS1                      
    69 2268               JG8        
    70 2179             JM7          
    71 2177               JH8     2317  
    72 2171     JK3               2289  
    73 2161             JH7       2276  
    74 2138             JE7       2413  
    75 2133     JL3               2580  
    76 2114             JK7          
    77 2083               JE8        
    78 2060             JR7       2168 2191
    79 2045 7M4                      
    80 2023             JL7          
    81 1951             JI7          
    82 1945           JH6         2036  
    83 1914                   JH0 1995  
    84 1895             JJ7          
    85 1859             JF7          
    86 1850             JG7          
    87 1828           JS6            
    88 1806         JH5           1929  
    89 1804       JE4             1936  
    90 1803       JR4             1916 1939
    91 1777       JH4             1875  
    92 1771                   JR0 1942 1975
    93 1757         JG5              
    94 1736         JE5           1737  
    95 1698 7L4                      
    96 1688           JR6         1727 1770
    97 1681       JF4                
    98 1671           JF6         1795  
    99 1658         JR5           1752 1783
    100 1629           JO6            
    101 1622                 JH9   1739  
    102 1559       JG4                
    103 1547                   JE0    
    104 1544         JF5              
    105 1523       JM4                
    106 1515       JL4                
    107 1474       JI4                
    108 1461           JN6            
    109 1459                 JR9     1495
    110 1438           JG6         1619  
    111 1433   JS2                    
    112 1418     JQ3                  
    113 1409                   JI0    
    114 1396       JK4                
    115 1381       JJ4                
    116 1367                 JE9      
    117 1366                   JF0    
    118 1359           JP6           1453
    119 1355     JR3               1450 1477
    120 1339                   JG0    
    121 1338           JM6            
    122 1318 7K4                      
    123 1311     JS3                  
    124 1293           JL6            
    125 1290           JK6            
    126 1279           JI6            
    127 1262           JJ6            
    128 1192 7M1                      
    129 1147 7N1                      
    130 1145 7M3                      
    131 1133 7K1                      
    132 1128 7K3                      
    133 1099 7N3                      
    134 1093 7L1                      
    135 1023 7L3                      
    136 1014 7L2                      
    137 1002 7N2                      
    138 990 7M2                      
    139 986 7K2                      
    140 115 JD1                   124  
    141 39 7J1                   46  
    142 38     7J3               45  
    143 16   7J2                 18  
    144 11           7J6         12  
    145 10       7J4             11  
    146 3               7J8     4  
    147 2             7J7       2  
    148 1                 7J9   1  
    149 1                   7J0 3  
    150 0         7J5           0  
    151                     JP0   64
    152                 JP8       38
    153                   JP9     35
    154         JP4               25
    155           JP5             18
    156   8J1                   10  
    157   8N1                   5  
    158       8J3               5  
    159       8N3               5  
    160             8J6         4  
    161               8J7       4  
    162     8N2                 2  
    163         8J4             2  
    164           8N5           2  
    165                 8J8     2  
    166                     8J0 2  
    167                     8N0 2  
    168     8J2                 1  
    169               8N7       1  
    170                 8N8     1  
    171                   8J9   1  
    172                   8N9   1  
    173         8N4             0  
    174           8J5           0  
    175             8N6         0  

[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
Nov. 6, 2016, Ryota "Roy" Motobayashi, JJ1WTL