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LEI

The Legal Entity Identifier (LEI) is a 20-digit, alpha-numeric code that connects to key reference information that enables clear and unique identification of companies participating in global financial markets, as defined by the Global Legal Entity Identifier Foundation (GLEIF)

ISO 17442 is the standard applicable to LEI

The URI for a Code defined by ISO standards is defined in the RFC5141, by using the URL of ISO followed by the Code, as:
LEI -> http://standards.iso.org/iso/17442/{LEI code}

Example using XBRL notation for LEI-based entity identification:
—     <xbrli:entity>
—        <xbrli:identifier scheme=”http://standards.iso.org/iso/17442″>
—               KGCEPHLVVKVRZYO1T647
—         </xbrli:identifier>
—      <xbrli:entity>

Browse the LEI database

ISIN

The International Securities Identification Number (ISIN) is used worldwide to identify specific securities such as bonds, stocks (common and preferred), futures, warrant, rights, trusts, commercial paper and options. ISINs are assigned to securities to facilitate unambiguous clearing and settlement procedures. They are composed of a 12-digit alphanumeric code and act to unify different ticker symbols “which can vary by exchange and currency” for the same security.

ISO 6166 is the standard applicable to ISIN

The URI for a Code defined by ISO standards is defined in the RFC5141, by using the URL of ISO followed by the Code, as:
ISIN -> http://standards.iso.org/iso/6166/{ISIN code}

Browse the ISIN database

ISO

The URI for a Code defined by ISO standards is defined in the RFC5141, by using the URL of ISO followed by the Code, as:
LEI -> http://standards.iso.org/iso/17442/{LEI code}
ISIN -> http://standards.iso.org/iso/6166/{ISIN code}

See below RFC 5141, ISO URN Schema, (page 16):

2.8. Process for Identifier Resolution
Resolving document identifiers:
This schema has been developed with the intent that a URN identifying an ISO document can be transformed to a valid http URI by replacing the requested URN namespace prefix (“iso”) and the “std:” prefix with the domain name “standards.iso.org”, replacing all occurrences of “:” within the identifier with “/”, and converting characters to lowercase. (ISO is planning to develop a website implementation to support these URIs.)
Examples:
urn:iso:std:iso:9999:-1:ed-1:en: corresponds to http://standards.iso.org/iso/9999/-1/ed-1/en/
urn:iso:std:iso-iec:tr:9999:-1:ed-1:en: corresponds to http://standards.iso.org/iso-iec/tr/9999/-1/ed-1/en/ urn:iso:std:iso:9999:-1:ed-2:en,fr:amd:2: corresponds to http://standards.iso.org/iso/9999/-1/ed-2/en,fr/amd/2/