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 Jan. 6, 2018, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club Stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 15171 JI1                   15242  
    2 12021 JH1                   12131  
    3 11816   JR2                 11926 11955
    4 11362     JP3                 11496
    5 11231             JP7         11278
    6 10334           JE6         10393  
    7 10062 JG1                   10128  
    8 8665 JF1                   8729  
    9 8429 JA1                   8679  
    10 8406               JL8        
    11 7796 JJ1                   7890  
    12 7171               JM8        
    13 7060             JO7          
    14 6969     JO3                  
    15 6868 JE1                   6949  
    16 6182           JA6         6333  
    17 6130         JJ5              
    18 5431                   JJ0    
    19 4579   JQ2                 4579  
    20 4345       JO4                
    21 4148   JS2                    
    22 4137               JK8        
    23 3648                 JF9      
    24 3643   JA2                 3852  
    25 3506       JN4                
    26 3342 JR1                   3460 3494
    27 3145     JN3                  
    28 3134 JK1                   3232  
    29 3097     JA3               3268  
    30 2958 JP1                     3106
    31 2933   JH2                 3030  
    32 2908 JL1                   3005  
    33 2902 JN1                   3003  
    34 2829 JM1                   2923  
    35 2822             JN7          
    36 2784 JO1                   2996  
    37 2780             JA7       2944  
    38 2756   JF2                 2853  
    39 2742   JI2                 2969  
    40 2731               JJ8        
    41 2648   JE2                 2743  
    42 2642 JQ1                   3467  
    43 2623   JP2                   2749
    44 2584   JG2                 2657  
    45 2583       JA4             2706  
    46 2569 7N4                      
    47 2513     JH3               2582  
    48 2503               JA8     2661  
    49 2463                   JA0 2570  
    50 2366               JI8        
    51 2348   JM2                    
    52 2329   JJ2                 2658  
    53 2326         JA5           2438  
    54 2228     JG3               2283  
    55 2226 JS1                      
    56 2225     JM3                  
    57 2224     JI3               2292  
    58 2216   JL2                    
    59 2214   JO2                    
    60 2211               JF8        
    61 2193               JG8        
    62 2184                 JA9   2295  
    63 2156         JI5              
    64 2142     JJ3               2202  
    65 2141     JE3               2207  
    66 2138             JM7          
    67 2137               JR8     2280 2300
    68 2127     JK3               2235  
    69 2119   JN2                    
    70 2084               JH8     2218  
    71 2077             JH7       2182  
    72 2065   JK2                    
    73 2048           JQ6         2048 2050
    74 2040     JL3               2508  
    75 2035     JF3               2112  
    76 2026             JR7       2121 2144
    77 1956             JE7       2235  
    78 1940             JL7          
    79 1918               JE8        
    80 1900             JI7          
    81 1881           JH6         1966  
    82 1874           JS6            
    83 1865 7M4                      
    84 1856             JJ7          
    85 1852                   JH0 1927  
    86 1832             JF7          
    87 1797             JK7          
    88 1736       JR4             1839 1861
    89 1701                   JR0 1868 1898
    90 1696       JE4             1843  
    91 1695       JH4             1787  
    92 1691         JH5           1808  
    93 1626         JR5           1720 1749
    94 1623         JG5              
    95 1621         JE5           1622  
    96 1616           JR6         1655 1695
    97 1587             JG7          
    98 1586           JO6            
    99 1532           JF6         1642  
    100 1523       JF4                
    101 1507                 JH9   1623  
    102 1493         JF5              
    103 1481       JL4                
    104 1463                   JE0    
    105 1444       JI4                
    106 1444       JM4                
    107 1416           JG6         1618  
    108 1409       JG4                
    109 1398     JQ3               1398  
    110 1394 7L4                      
    111 1328                 JR9   1328 1363
    112 1320           JN6            
    113 1314     JR3               1401 1428
    114 1313                   JF0    
    115 1312                   JI0    
    116 1291           JK6            
    117 1291           JP6           1373
    118 1261           JL6            
    119 1258       JJ4                
    120 1250                 JE9      
    121 1239     JS3                  
    122 1218 7K4                      
    123 1208                   JG0    
    124 1171       JK4                
    125 1143           JJ6            
    126 1131 7M3                      
    127 1127 7K1                      
    128 1107 7K3                      
    129 1102           JI6            
    130 1101           JM6            
    131 1084 7N3                      
    132 1027 7L1                      
    133 1026 7M1                      
    134 1005 7L3                      
    135 999 7N1                      
    136 990 7N2                      
    137 836 7K2                      
    138 834 7M2                      
    139 824 7L2                      
    140 112 JD1                   121  
    141 36 7J1                   43  
    142 36     7J3               43  
    143 15   7J2                 17  
    144 11           7J6         12  
    145 8       7J4             9  
    146 3               7J8     4  
    147 3                   7J0 4  
    148 1                 7J9   1  
    149 1         JP5*             19
    150 0         7J5           0  
    151 0             7J7       0  
    152                     JP0   62
    153                 JP8       29
    154                   JP9     29
    155         JP4               22
    156   8J1                   10  
    157       8J3               7  
    158               8J7       7  
    159   8N1                   5  
    160       8N3               3  
    161             8J6         3  
    162                     8N0 3  
    163     8J2                 2  
    164         8J4             2  
    165           8J5           1  
    166           8N5           1  
    167             8N6         1  
    168                 8J8     1  
    169     8N2                    
    170         8N4                
    171               8N7          
    172                 8N8        
    173                   8N9      
    174                   8J9      
    175                     8J0    

    *: Miss registration ... JP5 is NOT assignable for indiviruals.


[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
July 10, 2018, Ryota "Roy" Motobayashi, JJ1WTL