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The ''kennitala'' (plural: ''kennitölur''; abbreviated ''kt.'') ((英語:Identity Number)) is a unique national identification number used by the Icelandic government to identify individuals and organisations in Iceland, administered by the Registers Iceland. ''Kennitölur'' are issued to Icelandic citizens at birth, and to foreign nationals resident in Iceland upon registration. They are also issued to corporations and institutions. ==Number derivation== ''Kennitölur'' are composed of ten digits. For a personal ''kennitala'', the first six of these are the individual's date of birth in the format DDMMYY.〔 The seventh and eighth digits are randomly chosen (although the seventh number must be larger or equal to 2) when the ''kennitala'' is allocated, the ninth is a check digit, and the tenth indicates the century of the individual's birth: '9' for 1900–1999, '0' for 2000 and beyond. ''Kennitölur'' are often written with a hyphen following the first six digits, e.g. 120174-3399. D1D2M1M2Y1Y2R1R2CM D = day, M = Month, Y = year, R = random, C = checksum, M = century. The check digit equations is: C = 11 - ((3xD1 + 2xD2 + 7xM1 + 6xM2 + 5xY1 + 4xY2 + 3xR1 + 2xR2) mod 11) The consequence of this design is that at most 80 people can be born on the same day. The exact same formula is used for the identification numbers of organisations and companies, instead of the date of birth the initial registration date is used and then the number 4 is added to the first digit to makes sure there are no conflicts with individuals. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kennitala」の詳細全文を読む スポンサード リンク
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