When you are asked to provide your National-ID number, the format you should fill in depends on your nationality. Please refer to the table below for the different priority identifiers in your country.

At the bottom of the page, you will find information on what to do if the table states that you should use CONCAT as the identifier.

ISO 3166 — 1Country Name1st priority identifier2nd priority identifier3rd priority identifier
BE BelgiumBelgian National Number - 11 numerical digits where the first 6 are the date of birth (YYMMDD), the next 3 are an ordering number (uneven for men, even for women) and the last 2 a check digit. CONCAT
BG BulgariaBulgarian Personal Number - It consists of 10 digits. The first 6 are the date of birth (YYMMDD). The next 3 digits have information about the area in Bulgaria and the order of birth, and the ninth digit is even for a boy and odd for a girl. Seventh and eighth are randomly generated according to the city. The tenth digit is a check digit. CONCAT
CYCyprusNational Passport Number - The number for passports issued before 13/12/2010 consists of the character 'E' followed by 6 digits i.e E123456. Biometric passports issued after 13/12/2010 have a number that starts with the character 'K', followed by 8 digits. i.e K12345678CONCAT
CZCzech Republic National identification number (Rodné číslo) - It is a nine or ten-digit number in the format of YYXXDD/SSSC, where XX=MM (month of birth) for male, i.e. numbers 01-12, and XX=MM+50 (or exceptionally XX=MM+70) for female, i.e. numbers 51-62 (or 71-82). For example, a number 785723 representing the first six digits is assigned to a woman born on 23rd of July 1978. SSS is a serial number distinguishing persons born on the same date and C is a check digit. For people born before January 1st 1954 the number is without this check digit - YYXXDD/SSS (i.e. the nine-digit case). If the national identification number has ten digits, then the tenth (check) digit is the first nine digits modulo 11, unless this modulo is 10. In that case the tenth digit is 0. Therefore, the ten-digit number is usually divisible by 11Passport NumberCONCAT
DK DenmarkPersonal identity code 10 digits alphanumerical: The Danish personal ID is called the CPR number. It is 10 digits and does only consist of numbers [0-9]. The first 6 numbers represent the date of birth in “DDMMYY" format. CONCAT
EE EstoniaEstonian Personal Identification Code (Isikukood) - It consists of 11 digits, generally given without any whitespace or other delimiters. The form is GYYMMDDSSSC, where G shows sex and century of birth (odd number male, even number female, 1-2 19th century, 3-4 20th century, 5-6 21st century), SSS is a serial number separating persons born on the same date and C a checksum.
ESSpainTax identification number (Código de identificación fiscal) - Code composed by 9 characters: 8 numbers and a control letter. Letters I, Ñ, O, and U are not used. It looks like 99111222M. Particular cases - L + 7 numbers + control letter for non-resident Spaniards unless they have DNI, where then it would look like as above. - K + 7 numbers + control letter for Spaniards under 14 unless they have DNI, where then it would look like as above.
FIFinlandPersonal identity code - It consists of eleven characters of the form DDMMYYCZZZQ, where DDMMYY is the date of birth, C the century sign, ZZZ the individual number and Q the control character (checksum). The sign for the century is either + (1800–1899), - (1900–1999), or A (2000– 2099). The individual number ZZZ is odd for males and even for females and for people born in Finland its range is 002-899 (larger numbers may be used in special cases). An example of a valid code is 311280-888YCONCAT
GBUnited KingdomUK National Insurance number - Two prefix letters, followed by six digits with one suffix letter, which is always A, B, C, or D. It looks something like this: AB123456A. The characters D, F, I, Q, U and V are not used as either the first or second letter of the prefix. The letter O is not used as the second letter of the prefix. For administrative reasons HMRC and DWP have sometimes used reference numbers which look like NINOs but which do not use valid prefixes. The administrative prefixes used are: OO, CR, FY, MW, NC, PP, PZ, TN. These should not be used.CONCAT
GRGreece10 DSS digit investor share - It consists of 10 digits and it is linked with the personal details of the investor (name, identity number, passport number, tax registration number).CONCAT
HRCroatiaPersonal Identification Number (OIB — Osobni identifikacijski broj) - OIB consists of 11 digits. 10 digits are chosen randomly and do not contain information related to the holder of OIB. One digit is a control number. OIB is unique, unchangeable and unrepeatable. It is a permanent identification code of every Croatian citizen and legal person with head office in the Republic of Croatia. CONCAT
ISIcelandPersonal Identity Code (Kennitala) - Ten-digit number, where the first six are the date of birth (DDMMYY).
IT ItalyFiscal code (Codice fiscale) - The code is unique, widespread and consistent over time and it is a combination of 16 letters and numbers (3 letters for the last name + 3 letters for the name + 5 letters/numbers for the date of birth (with different combinations to distinguish between men and women) + 4 letters/numbers for the place of birth + 1 check letter/number). Example: RSS MRO 62B25 E205 Y
LILiechtensteinNational Passport Number - The Code is a combination of 1 letter and 5 numbers. For example R00536National Identity Card NumberCONCAT
LTLithuaniaPersonal code (Asmens kodas) - It is 11 digits long. Format GYYMMDDNNNC, where G is the gender (4 or 6 for women; 3 or 5 for men); YYMMDD is the date of birth; NNN - serial number; C - check digit. National Passport NumberCONCAT
LVLatviaPersonal code (Personas kods) - 11 numerical digits of the form DDMMYY-CZZZZ where the first 6 are the date of birth (DDMMYY) and the C is century sign (where the digit "0" is the 19th century, the number "1" - the 20th century, "2" - 21th century).CONCAT
MTMaltaNational Identification Number - 8 characters: 7 numerical digits and 1 alphabetic letter (M, G, A, P, L, H, B, Z) Each ID Card has a unique Identity Number, based on a combination of: (a) a sequential registration number in the relevant year; (b) the relevant year number (2 digits), where the year is the year of birth (for Malta-born persons) or year of registration (for nonMalta born persons), and (c) a letter designating the geographic origin of the person. The definition of the letters is given by the Public Registry Department on the registration of a birth A = applicable to Foreigners in possession of an eRes Card B = applicable to Maltese births registered in the 1800+ G= applicable to Gozitan births registered in the 1900+ H= applicable to Gozitan births registered in the 2000+ L= applicable to Maltese births registered in the 2000+ M= applicable to Maltese births registered in the 1900+ P= applicable to Maltese citizens who are unable to obtain their original birth certificate from their country of birth to be registered in Malta. Z= applicable to Gozitan births registered in the 1800+National Passport Number
NLNetherlandsNational Passport Number - 9 characters of which: Position 1 and 2: [A-Z] except for "O"; Position 3 - 8: [A-Z] [0-9] except for "O"; Position 9: [0-9].National identity card numbeCONCAT
NONorway 11 digit personal id (Foedselsnummer) - The id is 11 digits long, where the first 6 represent birthdate in "ddmmyy" format.CONCAT
PLPoland National Identification Number (PESEL) - 11 NUMERIC. ID for natural persons is assigned to a person shortly after birth by the birth registry and does not change throughout the life of a person.Tax Number (Numer identyfikacji podatkowej)
PTPortugal Tax number (Número de Identificação Fiscal) - Code composed by one block of 9 digits (999999999). The first eight digits are sequential and the last one is used as a control: 1 to 3: Personal, 3 is not yet assigned; 45: Natural person. The initial digits "45" correspond to non-residents citizens that only get in Portuguese territory income subject to withholding at source; 5: legal person required to register in the National People Collective Registry; 6: The agencies of the Central Government, Regional or Local administration; 70, 74 and 75: Used to identify different types of Heritage Indivisible; 71: Collective non-residents subject to withholding at source definitively; 72: Investment Funds; 77: officious allocation of taxable NIF (entities that do not require NIF on the official bodies (RNPC); 78: officious assignment to non-residents covered by the proceeding VAT REFUND; 79: Exceptional rules - created in 98 exclusively to the Mundial Exposition (Expo 98); 8: "sole trader" (no longer used, is no longer valid); 90 and 91: Condos, Irregular Society and undivided inheritances; 98: Non-residents without permanent establishment; 99: Civil societies without legal personality.National Passport Number CONCAT
RORomania National Identification Number (Cod Numeric Personal) - Romanian Personal Numerical Code (Cod Numeric Personal, CNP) consist of 13 digits and is created by using the citizen's gender and century of birth (1/3/5/7 for male, 2/4/6/8 for female and 9 for foreign citizen), date of birth (six digits, YYMMDD), the country zone (two digits, from 01 to 52, or 99), followed by a serial number (3 digits), and finally a checksum digit. The first digit encodes the gender of person as follows: 1 Male born between 1900 and 1999 2 Female born between 1900 and 1999 3 Male born between 1800 and 1899 4 Female born between 1800 and 1899 5 Male born after 2000 6 Female born after 2000 7 Male resident 8 Female resident 9 Foreign citizen The country zone is a code of Romanian county in alphabetical order. For Bucharest the code is 4 followed by the sector number. To calculate the checksum digit, every digit from CNP is multiplied with the corresponding digit in number 279146358279; the sum of all these multiplications is then divided by 11. If the remainder is 10 then the checksum digit is 1, otherwise it's the remainder itself.National Passport NumberCONCAT
SESwedenPersonal identity number (Personnummer) - Personal code number: 12 digits numerical in the format CCYYMMDDZZZQ CCYYMMDD is the date of birth, ZZZ the individual serial number, and Q is the control character (calculated with Luhn-algoritm). The individual number ZZZ is odd for males and even for females. CC is century, YY year, MM month and DD day. CONCAT
SISlovenia Personal Identification Number (EMŠO: Enotna Matična Številka Občana) - It consists of 13 digits. The first 7 numbers represent the date of birth of the person - DDMMYYY. Digit 8 and 9 represent the number of a register where EMŠO was assigned: • 10-19 – Bosnia and Hercegovina (if signed in before 18 February 1999) • 20-29 – Montenegro (if signed in before 18 February 1999) • 30-39 – Croatia (if signed in before 18 February 1999) • 40-49 – Macedonia (if signed in before 18 February 1999) • 50-59 – Slovenia (if signed in before 18 February 1999, if later number 50 is used) • 60-69 – (not in use) • 70-79 – Serbia (if signed in before 18 February 1999) • 80-89 – Autonomous Province of Vojvodina (if signed in before 18 February 1999) • 90-99 – Kosovo (if signed in before 18 February 1999)). Digit 10, 11 and 12 are a combination of gender and serial number for persons, born on the same day (000-499 for male and 500-999 for female). Number 13 is a control number and is calculated by a special procedure, defined in Article 4 of the Regulation on the way of assigning the personal identification number (Nos. no. 8/99).CONCAT
SKSLOVAKIAPersonal number (Rodné číslo) - The Personal Number consist of ten digits in the form YYMMDDCCCX. The first part is created from the date of birth (differently for male and female): YY - the last 2 digits of the year of birth; MM - month of birth for male (01 -12), month of birth plus 50 for female (51-62); DD - day of birth; CCC- number distinguishing persons born on the same date; X - check digit. The Person Number must be divisible by 11.National Passport NumberCONCAT
All other countries National Passport NumberCONCAT
Edit Table

Where the identifier refers to CONCAT, the person shall be identified by using the concatenation of the following elements in the following order:

(a) the date of birth of the person in the format YYYYMMDD; (b) the five first characters of the first name; (c) the five first characters of the surname.

Prefixes to names shall be excluded and first names and surnames shorter than five characters shall be appended by ‘#’ so as to ensure that references to names and surnames in accordance with paragraph 4 contain five characters. All characters shall be in upper case. No apostrophes, accents, hyphens, punctuation marks or spaces shall be used.

John Engholm is born on December 5, 1985. His CONCAT is 19851205JOHN#ENGHO
Melissa Smith is born on July 3, 1972. Her CONCAT is 19720703MELISSMITH