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. 24, 2016, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club Stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 15418 JI1                   15497  
    2 14133 JH1                   14247  
    3 12677   JR2                 12790 12819
    4 10515     JP3                 10655
    5 10194             JP7         10242
    6 10155 JG1                   10220  
    7 10022           JE6         10081  
    8 9420 JF1                   9489  
    9 8859               JL8        
    10 8598 JA1                   8846  
    11 7462             JO7          
    12 7457     JO3                  
    13 7157 JE1                   7240  
    14 6388               JM8        
    15 6382           JA6         6535  
    16 5877         JJ5              
    17 5292                   JJ0    
    18 4957   JQ2                    
    19 4287       JO4                
    20 4279               JK8        
    21 3804       JN4                
    22 3746 JJ1                   3841  
    23 3715   JA2                 3933  
    24 3711                 JF9      
    25 3380 JR1                   3498 3533
    26 3257     JN3                  
    27 3194 JK1                   3308  
    28 3167     JA3               3337  
    29 3025 JP1                     3181
    30 3005   JS2                    
    31 2997 JO1                   3214  
    32 2995   JH2                 3095  
    33 2963             JN7          
    34 2939 JN1                   3050  
    35 2898 JL1                   2996  
    36 2873             JA7       3039  
    37 2846 JM1                   2949  
    38 2822   JI2                 3059  
    39 2814   JE2                 2917  
    40 2755   JF2                 2856  
    41 2746               JJ8        
    42 2743 7N4                      
    43 2672   JG2                 2755  
    44 2669 JQ1                   3467  
    45 2654   JP2                   2784
    46 2654       JA4             2782  
    47 2568               JA8     2732  
    48 2567     JH3               2641  
    49 2536               JI8        
    50 2506                   JA0 2619  
    51 2417   JL2                    
    52 2394   JM2                    
    53 2356     JG3               2413  
    54 2356     JM3                  
    55 2354               JF8        
    56 2346         JA5           2456  
    57 2330   JJ2                 2655  
    58 2317   JO2                 2317  
    59 2308     JJ3               2373  
    60 2259 JS1                      
    61 2256                 JA9   2371  
    62 2254     JI3               2324  
    63 2254         JI5              
    64 2239               JR8     2379 2399
    65 2220               JG8        
    66 2187   JN2                    
    67 2182           JQ6           2183
    68 2176     JF3               2254  
    69 2170     JE3               2237  
    70 2156             JM7          
    71 2155     JK3               2272  
    72 2144   JK2                    
    73 2144               JH8     2283  
    74 2123             JH7       2229  
    75 2091     JL3               2542  
    76 2063             JE7       2343  
    77 2039             JR7       2139 2162
    78 2025 7M4                      
    79 2024             JL7          
    80 1986               JE8        
    81 1955             JK7          
    82 1939             JI7          
    83 1909           JH6         1997  
    84 1880                   JH0 1958  
    85 1876             JJ7          
    86 1870           JS6            
    87 1839             JF7          
    88 1787       JE4             1929  
    89 1763         JH5           1880  
    90 1756       JR4             1869 1891
    91 1744             JG7          
    92 1735         JG5              
    93 1732       JH4             1829  
    94 1725                   JR0 1896 1927
    95 1723         JE5           1724  
    96 1663           JR6         1701 1744
    97 1640         JR5           1734 1765
    98 1639           JF6         1756  
    99 1607           JO6            
    100 1577       JF4                
    101 1564                 JH9   1678  
    102 1551       JG4                
    103 1533                   JE0    
    104 1526 7L4                      
    105 1500       JL4                
    106 1498         JF5              
    107 1471           JN6            
    108 1457       JM4                
    109 1453       JI4                
    110 1420           JG6         1604  
    111 1417     JQ3                  
    112 1384                 JR9     1420
    113 1352       JK4                
    114 1344                 JE9      
    115 1333     JR3               1424 1451
    116 1323                   JI0    
    117 1318                   JG0    
    118 1313                   JF0    
    119 1302           JP6           1387
    120 1298           JK6            
    121 1286       JJ4                
    122 1275           JL6            
    123 1269     JS3                  
    124 1250           JJ6            
    125 1234 7K4                      
    126 1181           JI6            
    127 1146           JM6            
    128 1140 7M3                      
    129 1126 7K1                      
    130 1122 7K3                      
    131 1080 7N3                      
    132 1043 7L1                      
    133 1038 7M1                      
    134 1015 7L3                      
    135 1003 7N1                      
    136 1003 7N2                      
    137 999 7L2                      
    138 984 7M2                      
    139 922 7K2                      
    140 115 JD1                   125  
    141 40 7J1                   47  
    142 37     7J3               44  
    143 16   7J2                 18  
    144 11           7J6         12  
    145 8       7J4             9  
    146 3               7J8     4  
    147 3                   7J0 4  
    148 1             7J7       1  
    149 1                 7J9   1  
    150 0         7J5           0  
    151 1*         JP5             18
    152         JP4               25
    153                 JP8       33
    154                   JP9     35
    155                     JP0   62
    156   8J1                   14  
    157       8J3               5  
    158     8J2                 3  
    159         8J4             3  
    160             8J6         3  
    161               8J7       3  
    162       8N3               2  
    163     8N2                 2  
    164               8N7       2  
    165   8N1                   1  
    166                     8N0 1  
    167         8N4                
    168           8J5              
    169           8N5              
    170             8N6            
    171                 8J8        
    172                 8N8        
    173                   8J9      
    174                   8N9      
    175                     8J0    

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


[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
Jan. 28, 2017, Ryota "Roy" Motobayashi, JJ1WTL