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-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:
    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. 9, 2019, according to individual stations' call signs.

    Ranking# of CallsAreacf. including
    Club stations
    cf. including
    Clubs stations, Repeaters and
    Repeater's Remote Controllers
    123456789Ø
    1 14833 JI1 14895
    2 11730 JP7 11782
    3 11689 JP3 11819
    4 11112 JJ1 11204
    5 10597 JR2 10699 10728
    6 10354 JE6 10411
    7 10047 JH1 10158
    8 10003 JG1 10069
    9 7932 JA1 8181
    10 7850 JM8
    11 7836 JL8
    12 7602 JF1 7668
    13 6782 JE1 6860
    14 6675 JO7
    15 6364 JO3
    16 6336 JJ5
    17 5900 JA6 6046
    18 5338 JJ0
    19 5241 JS2
    20 4371 JO4
    21 4329 JQ2
    22 3923 JK8
    23 3624 JF9
    24 3488 JA2 3686
    25 3307 JR1 3424 3455
    26 3250 JN4
    27 2987 JN3
    28 2971 JA3 3136
    29 2858 JK1 2949
    30 2854 JN1 2946
    31 2836 JH2 2928
    32 2805 JL1 2899
    33 2792 JM1 2886
    34 2725 JO1 2927
    35 2700 JA7 2863
    36 2695 JP1 2839
    37 2665 JN7
    38 2618 JJ8
    39 2591 JQ1 3393
    40 2513 JP2 2634
    41 2507 JA4 2628
    42 2485 7N4
    43 2473 JI2 2687
    44 2469 JE2 2555
    45 2399 JF2 2487
    46 2393 JA8 2542
    47 2357 JG2 2427
    48 2348 JA0 2452
    49 2296 JJ2 2640
    50 2262 JH3 2329
    51 2242 JA5 2350
    52 2197 JS1 2258
    53 2197 JI8
    54 2165 JM3
    55 2150 JG8
    56 2110 JM7
    57 2106 JE3 2170
    58 2092 JA9 2205
    59 2086 JG3 2139
    60 2085 JN2
    61 2079 JJ3 2136
    62 2074 JI5
    63 2067 JO2
    64 2052 JM2
    65 2048 JL2
    66 2046 JK2
    67 2026 JI3 2086
    68 2020 JH7 2122
    69 1969 JR7 2059 2082
    70 1969 JF3 2034
    71 1968 JH8 2093
    72 1955 JL3 2416
    73 1947 JF8
    74 1925 JR8 2066 2085
    75 1886 JE8
    76 1876 JK3 1983
    77 1859 JE7 2138
    78 1839 JQ6 1841
    79 1839 JS6
    80 1835 JJ7
    81 1826 JH6 1906
    82 1778 JH0 1849
    83 1770 JF7
    84 1765 JK7
    85 1714 JL7
    86 1689 JI7
    87 1669 JH4 1755
    88 1656 7M4
    89 1646 JR4 1745 1766
    90 1624 JH5 1736
    91 1616 JR0 1773 1800
    92 1589 JE4 1740
    93 1556 JG7
    94 1553 JR5 1660 1688
    95 1523 JR6 1565 1601
    96 1496 JF4
    97 1469 JF5
    98 1459 JE5 1460
    99 1453 JG5
    100 1447 JF6 1550
    101 1428 JH9 1550
    102 1419 JO6
    103 1406 JM4
    104 1382 JG6 1586
    105 1377 JQ3
    106 1373 JI4
    107 1370 7L4
    108 1327 JE0
    109 1289 JF0
    110 1285 JI0
    111 1268 JL4
    112 1260 JP6 1338
    113 1245 JR3 1329 1352
    114 1242 JR9 1276
    115 1233 JJ4
    116 1219 JL6
    117 1218 JS3
    118 1215 7K4
    119 1207 JG4
    120 1186 JN6
    121 1156 JK6
    122 1132 JK4
    123 1132 JE9
    124 1120 7K1
    125 1120 7M3
    126 1081 7N3
    127 1072 JI6
    128 1072 JM6
    129 1070 JG0
    130 1017 7L1
    131 1016 JJ6
    132 1008 7M1
    133 985 7N1
    134 948 7L3
    135 896 7K3
    136 827 7K2
    137 817 7N2
    138 799 7L2
    139 797 7M2
    140 111 JD1 120
    141 36 7J3 43
    142 29 7J1 36
    143 15 7J2 17
    144 10 7J6 11
    145 6 7J4 7
    146 3 7J8 4
    147 3 7J0 4
    148 1 JP5* 21
    149 0 7J5
    150 0 7J7
    151 0 7J9
    152 JP0 58
    153 JP8 28
    154 JP9 28
    155 JP4 23
    156 8J1 9
    157 8J7 7
    158 8J3 5
    159 8J6 4
    160 8N1 3
    161 8N3 3
    162 8J4 2
    163 8J0 2
    164 8J2 1
    165 8N4 1
    166 8N5 1
    167 8N6 1
    168 8N7 1
    169 8J8 1
    170 8N8 1
    171 8J9 1
    172 8N2
    173 8J5
    174 8N9
    175 8N0

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


[ General ]   [ Prefix ]   [ Suffix ]   [ Special Operation ]   [ 7J-8N ]   [ Designator ]   [ Official Criteria ]   ( callsign.jp )
Jan 20, 2019, Ryota "Roy" Motobayashi, JJ1WTL