Prefix


[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )

  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
    2006-2021
    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. 6, 2021, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 15052 JJ1 15128
    2 12091 JP7 12138
    3 11558 JP3 11677
    4 10577 JI1 10634
    5 10318 JE6 10366
    6 10042 JH1 10145
    7 8805 JM8
    8 8263 JR2 8355 8384
    9 7772 JG1 7834
    10 7462 JF1 7522
    11 7234 JS2
    12 6969 JL8
    13 6918 JA1 7157
    14 6428 JJ5
    15 6245 JE1 6318
    16 5908 JO7
    17 5272 JO3
    18 5100 JA6 5238
    19 5073 JJ0*
    20 4885 JK1 4974
    21 4555 JO4
    22 3877 JQ2
    23 3654 JK8
    24 3599 JF9
    25 3144 JA2 3334
    26 2968 JR1 3071 3101
    27 2854 JN4
    28 2686 JA3 2840
    29 2652 JN3
    30 2567 JN1 2647
    31 2562 JO1 2748
    32 2486 JP1 2621
    33 2482 JL1 2550
    34 2472 JA7 2628
    35 2463 JH2 2545
    36 2445 JN7
    37 2443 JQ3
    38 2369 JE2 2449
    39 2352 JM1 2445
    40 2280 JA4 2391
    41 2202 JG2 2264
    42 2198 JJ8
    43 2170 JA0 2263
    44 2164 JI2 2331
    45 2155 JQ1 2861
    46 2152 JP2 2268
    47 2150 JI8
    48 2149 JF2 2227
    49 2147 JH3 2211
    50 2130 JA8 2264
    51 2106 7N4
    52 2053 JA5 2147
    53 1913 JF3 1974
    54 1901 JE3 1958
    55 1896 JG3 1938
    56 1894 JL2
    57 1892 JS1 2070
    58 1890 JM3
    59 1874 JJ3 1921
    60 1863 JA9 1970
    61 1860 JM2
    62 1843 JH7 1933
    63 1823 JK2
    64 1822 JG8
    65 1815 JI3 1870
    66 1809 JF8
    67 1804 JR8 1943 1958
    68 1800 JE7 2080
    69 1781 JJ2 2134
    70 1736 JR7 1816 1838
    71 1731 JI5
    72 1730 JO2
    73 1725 JH8 1837
    74 1717 JN2
    75 1717 JS6
    76 1715 JK7
    77 1668 JQ6 1670
    78 1650 JH6 1725
    79 1645 JK3 1733
    80 1640 JH0 1700
    81 1625 JM7
    82 1610 JE8
    83 1600 JL3 2036
    84 1564 JL7
    85 1530 JI7
    86 1519 JH4 1598
    87 1499 7M4
    88 1498 JH5 1594
    89 1497 JG7
    90 1490 JF7
    91 1470 JR4 1552 1570
    92 1469 JR6 1506 1537
    93 1454 JR0 1605 1628
    94 1442 JJ7
    95 1441 JE4 1605
    96 1419 JF6 1505
    97 1383 JR5 1490 1517
    98 1376 JE5 1377
    99 1354 JG5
    100 1332 7L4
    101 1323 JF4
    102 1246 JE0
    103 1230 JF5
    104 1221 JH9 1337
    105 1164 JG4
    106 1152 JG6 1392
    107 1149 JR3 1234 1256
    108 1148 JM4
    109 1132 JN6
    110 1132 JO6
    111 1088 JF0
    112 1087 JK4
    113 1074 JL4
    114 1072 JI4
    115 1065 JI0
    116 1062 JJ4
    117 1041 JR9 1074
    118 1039 JM6
    119 1026 JI6
    120 1022 7K4
    121 1016 JG0
    122 996 JS3
    123 974 7M1
    124 966 7N1
    125 963 JK6
    126 955 JP6 1025
    127 954 JE9
    128 949 JJ6
    129 945 JL6
    130 904 7K1
    131 857 7K3
    132 847 7L1
    133 846 7M3
    134 833 7N3
    135 814 7K2
    136 808 7N2
    137 781 7L2
    138 775 7M2
    139 759 7L3
    140 118 JD1 129
    141 31 7J3 38
    142 25 7J1 32
    143 13 7J2 17
    144 6 7J4 7
    145 6 7J6 7
    146 3 7J0 4
    147 1 7J8
    148 0 7J5 0
    149 0 7J7 0
    150 0 7J9 0
    151 JP0 49
    152 JP9 26
    153 JP8 23
    154 JP4 21
    155 JP5 20
    156 8J1 12
    157 8J3 6
    158 8N1 3
    159 8N3 3
    160 8J4 3
    161 8J6 3
    162 8J2 2
    163 8N6 2
    164 8J0 2
    165 8N2 1
    166 8N4 1
    167 8J7 1
    168 8J5 0
    169 8N5 0
    170 8N7 0
    171 8J8 0
    172 8N8 0
    173 8J9 0
    174 8N9 0
    175 8N0 0

[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
Feb. 1, 2021, Ryota "Roy" Motobayashi, JJ1WTL