How does the MOD-97 algorithm from the ISO 7064 standard work?

Algorithm: (1) moves the first 4 characters (country code + check digits) to the end of the string, (2) converts letters to numbers (A=10, B=11, ..., Z=35), forming a ~30 digit integer, (3) calculates remainder % 97: if even, IBAN is mathematically valid. Error detection precision: 98.9%.

Difference between BBAN and IBAN?

Basic Bank Account Number is the national identifier of the account (e.g. CIN+ABI+CAB+account in Italy = 22 chars). International Bank Account Number = country code + check digits + BBAN. IT: 27 chars. DE: 22 chars. FR: 27 chars. NL: 18 chars. Max ISO 13616: 34 chars.

How do I convert a letter to a number in the check digit?

Alphanumeric ISO 7064 mapping: A=10, B=11, C=12 ... Z=35. Char-by-char conversion on the entire string after rearranging. Example GB82WEST...: G=16, B=11 → replacement of "1611" at position. JavaScript function: `c.charCodeAt(0) - 55` for uppercase letters.

Are generated IBANs valid for real transfers?

No. Checks pass the MOD-97 checksum but BBAN is random so account doesn't exist. Exclusive use: unit tests, form validation, mock data for development. Always use SWIFT/BIC + real IBAN of customer in production.

Can I validate an IBAN in Java/Python/Go without libraries?

Yes: Java `new BigInteger(rearranged).mod(BigInteger.valueOf(97)).intValue() == 1`. Python `int(rearranged) % 97 == 1`. Go requires `math/big` for integers > int64. TypeScript uses BigInt since 30 digits exceed Number.MAX_SAFE_INTEGER (2^53).

What are the country length limits for ISO 3166?

Fixed lengths: NO=15, BE/NL=16, DK/FI/GL=18, AT/LV/LT=20, BG/EE/KZ=20, CH/LI=21, DE/LU=22, ES/IS=22, IT/SM=27, PL/PT=28, FR/GB/GI=22-24, MT=31, RU=33. Maximum ISO 13616: 34 characters. BCD (Electronic IBAN): no spaces, always uppercase.

IBAN Generator - Validazione MOD-97 ISO 13616

Genera IBAN

Paese

Formato:ITkk XBBB BBCC CCCA AAAA AAAA AAAEsempio:IT60X0542811101000000123456

Codice Banca (opzionale)

Codice Filiale (opzionale)

Numero Conto (opzionale)

Paesi Supportati

ITItalia27 char
DEGermania22 char
FRFrancia27 char
ESSpagna24 char
GBRegno Unito22 char
NLPaesi Bassi18 char
BEBelgio16 char
ATAustria20 char
CHSvizzera21 char
PTPortogallo25 char
PLPolonia28 char
SESvezia24 char
NONorvegia15 char
DKDanimarca18 char
FIFinlandia18 char
IEIrlanda22 char
GRGrecia27 char
CZRepubblica Ceca24 char
SKSlovacchia24 char
HUUngheria28 char
RORomania24 char
BGBulgaria22 char
HRCroazia21 char
SISlovenia19 char
LTLituania20 char
LVLettonia21 char
EEEstonia20 char
CYCipro28 char
MTMalta31 char
LULussemburgo20 char
MCMonaco27 char
SMSan Marino27 char
VACittà del Vaticano22 char
LILiechtenstein21 char
ISIslanda26 char
ADAndorra24 char
GIGibilterra23 char
ALAlbania28 char
BABosnia ed Erzegovina20 char
MEMontenegro22 char
RSSerbia22 char
MKMacedonia del Nord19 char
XKKosovo20 char
MDMoldavia24 char
UAUcraina29 char
BYBielorussia28 char
GEGeorgia22 char
AZAzerbaigian28 char
TRTurchia26 char
RURussia33 char
ILIsraele23 char
SAArabia Saudita24 char
AEEmirati Arabi Uniti23 char
QAQatar29 char
KWKuwait30 char
BHBahrain22 char
JOGiordania30 char
LBLibano28 char
IQIraq23 char
PSPalestina29 char
EGEgitto29 char
TNTunisia24 char
MRMauritania27 char
MUMauritius30 char
SCSeychelles31 char
BRBrasile29 char
CRCosta Rica22 char
GTGuatemala28 char
SVEl Salvador28 char
DORepubblica Dominicana28 char
TLTimor Est23 char
PKPakistan24 char
KZKazakistan20 char
MAMarocco28 char
DZAlgeria24 char
LYLibia25 char
SDSudan18 char
STSão Tomé e Príncipe25 char
OMOman23 char
YEYemen30 char
MNMongolia20 char
HNHonduras28 char
LCSaint Lucia32 char
VGIsole Vergini Britanniche24 char
FOIsole Faroe18 char
GLGroenlandia18 char

Come utilizzare Generatore IBAN

Select a country

Choose the country from the dropdown menu. Each country has a unique IBAN format with varying length and structure. An example format is shown automatically.

Insert optional data

You can specify the bank code, branch number and account number. If left blank, valid random values will be generated for the selected country.

Generate Iban Code

Click on "Generate IBAN" to get a valid IBAN code. The code is calculated using the MOD-97 algorithm (ISO 7064) to ensure the validity of the check digit.

Copy and analyze the result

Click on the copy button to copy your Iban in notes. In the "Iban Sections" section you can copy each part individually: country code, check digits, bank code and account number.

Use bulk mode to generate more than one

Activate the "Bulk" mode to generate up to 100 IBANs simultaneously. Export results in CSV or TXT format for testing purposes.

Suggerimenti

Use bulk mode with CSV export to generate complete test datasets that can be imported directly into your project or database.
Verify IBAN in the sidebar allows you to check any IBAN instantly, including those from other sources.
The last 10 generated IBANs are automatically saved in the browser, so you can reuse them even after closing the page.

Domande frequenti

Are the generated IBANs real and usable for bank transactions?

No. Generated IBANs are mathematically valid (exceed MOD-97 verification) but are fictional and do not correspond to real bank accounts. They are intended exclusively for software development testing, form validation, and data simulation.

How does the MOD 97 validation of IBAN work?

The MOD-97 algorithm (ISO 7064 standard) moves the first four digits to the end of the IBAN, converts letters to numbers (A=10, B=11, ...) and checks if the remainder of division by 97 is equal to 1. This method detects 98.9% of transcription errors.

Which countries does the generator support for IBAN?

The generator supports the main European countries including Italy, Germany, France, Spain, UK, Netherlands, Belgium, and Austria, as well as other SEPA countries, each with its own format and length.

Can I use my own custom bank code?

Yes. You can manually enter the bank code and branch code in optional fields, and the generator will automatically calculate the correct check digits to make the IBAN valid according to the MOD-97 standard.

How is an Italian IBAN composed?

An Italian IBAN (IT) is composed of 27 characters: 2 letters for the country code (IT), 2 digits for the check digit, 1 letter for the national ID number, 5 digits for the bank's ABI code, 5 digits for the branch's CAB code, and 12 alphanumeric characters for the account number.

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