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 for amateurs. These are reserved for unexpected future use, the JARL said. (Instead of the reservation, we chose the recycle of expired call signs at the shortage era.) But, the original reasons are the follows. It's somewhat a simple story:

    JD is reserved for Ogasawara. Only JD1 exists, no other numbers (i.e. JD2-JD0 don't exist).
    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
    2006-2021
    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
    2021-NOW
    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
    2016-2020
    1984-1985
    1995
    1981-1982
    1994
    1990-1991 2000-NOW 1987-1988 1989-1991 1993-1995   1997-NOW
    JK 1977-1978
    1988-1989
    2020-NOW
    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
    2011-2019
    Repeater Repeater 1994-1996 2009-2021 Repeater Repeater Repeater
    JQ 1983-1984
    1989-1990
    1991-1992
    2001-2007
    1989-1990
    2019-NOW
        1996-1999 2021-NOW      
    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:
    ex-JR6RVK in Miyazaki-city
    JS6AWR in Kanoya-city
    ex-JS6IPG in Yoshinogari-town, Kanzaki-gun
    Okinawa Used Exceptionally as:
    ex-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. 5, 2022, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 14534 JJ1 14606
    2 11307 JP7 11353
    3 10550 JP3 10666
    4 9674 JE6 9722
    5 9563 JH1 9656
    6 9051 JI1 9108
    7 8963 JM8
    8 8373 JK1 8459
    9 7916 JR2 8004 8032
    10 7797 JS2
    11 7299 JF1 7359
    12 7244 JG1 7304
    13 6785 JA1 7013
    14 6681 JL8
    15 6474 JJ5
    16 5662 JE1 5729
    17 5589 JO7
    18 5121 JO3
    19 5093 JJ0*
    20 4908 JO4
    21 4758 JA6 4899
    22 3892 JQ3
    23 3545 JF9
    24 3516 JQ2
    25 3473 JK8
    26 3037 JA2 3223
    27 2915 JR1 3013 3043
    28 2598 JA3 2747
    29 2596 JN4
    30 2481 JL1 2549
    31 2478 JP1 2614
    32 2466 JO1 2637
    33 2414 JN1 2491
    34 2394 JA7 2539
    35 2368 JN3
    36 2360 JH2 2439
    37 2343 JM1 2421
    38 2325 JF6 2406
    39 2265 JE2 2337
    40 2224 JN7
    41 2183 JA4 2294
    42 2181 JJ8
    43 2140 JQ1 2799
    44 2137 JI2 2301
    45 2133 JF2 2198
    46 2108 JH3 2174
    47 2089 JA0 2180
    48 2037 JA8 2163
    49 2024 JI8
    50 2008 7N4
    51 1997 JG2 2046
    52 1980 JA5 2070
    53 1931 JP2 2045
    54 1881 JG3 1920
    55 1867 JL2
    56 1860 JS1 2093
    57 1824 JJ3 1868
    58 1808 JA9 1912
    59 1797 JF3 1860
    60 1784 JH7 1872
    61 1771 JM3
    62 1771 JF8
    63 1764 JJ2 2114
    64 1748 JM2
    65 1737 JE3 1788
    66 1723 JG8
    67 1703 JR8 1839 1854
    68 1701 JR7 1777 1799
    69 1694 JO2
    70 1691 JI3 1742
    71 1679 JH8 1780
    72 1669 JE7 1940
    73 1667 JS6
    74 1655 JI5
    75 1641 JK2
    76 1628 JK3 1711
    77 1600 JN2
    78 1593 JH6 1663
    79 1589 JM7
    80 1561 JH0 1619
    81 1545 JL7
    82 1517 JL3 1946
    83 1511 JK7
    84 1499 JQ6 1502
    85 1498 JI7
    86 1491 7M4
    87 1483 JE8
    88 1465 JF7
    89 1462 JH4 1535
    90 1438 JH5 1529
    91 1426 JE4 1588
    92 1412 JJ7
    93 1409 JR4 1485 1502
    94 1400 JR0 1547 1569
    95 1392 JR6 1429 1458
    96 1381 JG7
    97 1330 JE5 1331
    98 1319 JG5
    99 1316 JR5 1424 1448
    100 1214 JE0
    101 1180 JF4
    102 1158 JR3 1240 1262
    103 1150 JG6 1399
    104 1150 JH9 1270
    105 1145 7L4
    106 1142 JG4
    107 1137 JF5
    108 1116 JO6
    109 1098 JN6
    110 1068 JL4
    111 1042 JM4
    112 1034 JI4
    113 1019 JK4
    114 971 JG0
    115 970 JR9 1003
    116 967 JI0
    117 954 JF0
    118 947 JS3
    119 941 JI6
    120 940 JK6
    121 939 7K4
    122 933 JJ4
    123 925 JJ6
    124 916 JL6
    125 916 JE9
    126 911 JQ7
    127 899 JP6 964
    128 884 7K1
    129 871 7K3
    130 852 JM6
    131 841 7M3
    132 820 7N3
    133 811 7N1
    134 804 7N2
    135 801 7L1
    136 792 7M1
    137 777 7M2
    138 775 7L2
    139 766 7L3
    140 726 7K2
    141 116 JD1 133
    142 28 7J3 35
    143 22 7J1 29
    144 13 7J2 17
    145 6 7J4 7
    146 5 7J6 6
    147 2 7J0 3
    148 1 7J8
    149 0 7J5
    150 0 7J7
    151 0 7J9
    152 JP0 48
    153 JP9 26
    154 JP4 23
    155 JP8 22
    156 JP5 21
    157 8J1 18
    158 8J3 7
    159 8N1 6
    160 8J2 6
    161 8J7 5
    162 8N3 3
    163 8N0 3
    164 8J4 2
    165 8J6 2
    166 8N6 2
    167 8J8 2
    168 8J9 2
    169 8N9 2
    170 8N7 1
    171 8N2 0
    172 8N4 0
    173 8J5 0
    174 8N5 0
    175 8N8 0
    176 8J0 0

    *: Including a miss registration: JPO(Oscar)FFS.
    : Including a miss registration: JBSL217 (accturally JM8NSI).


[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
Jan. 15, 2022, Ryota "Roy" Motobayashi, JJ1WTL