ISIN (International Securities Identification Number)

Requires .NET 8

The ISIN code is a 12-character alphanumeric code that serves for uniform identification of a security through normalization of the assigned National Number, where one exists, at trading and settlement.

Library to parse/format ISIN codes following the ISO 6166 standard.

Implemented as a non-allocating struct that can live on the stack.

Usage

Isin isin = Isin.Parse("US0378331005");

string cc        = isin.CountryCode // "US"
string basicCode = isin.BasicCode   // "037833100"
int checkDigit   = isin.CheckDigit  // 5

if (Isin.TryParse(inputString, out var isin))
{
    ...
}

Benchmark

Isin.Benchmark:

Method	Mean	Error	StdDev	Gen0	Allocated
Isin_Parse	26.269 ns	0.0949 ns	0.0888 ns	-	-
Isin_TryParse	27.478 ns	0.1148 ns	0.1018 ns	-	-
Isin_ToString	9.533 ns	0.1451 ns	0.1357 ns	0.0010	48 B
Isin_BasicCode	9.028 ns	0.2238 ns	0.2198 ns	0.0008	40 B
Isin_CountryCode	8.739 ns	0.2169 ns	0.2498 ns	0.0006	32 B