GST (Goods and Services Tax): Made of different formats for each country, and can include letters and numbers

More info here: https://quaderno.io/blog/what-is-gst-and-which-countries-have-it/

LIC CN (Business license in China also called Unified Social Credit Code): Made of 18 digits

More info here: How to find a Chinese company registration number

VAT (Value-Added Tax identification number): Every country in Europe has its own format but it always contains the prefix of the country in 2 letters (FR for France) and then 7 to 11 digits.

More info here: https://en.wikipedia.org/wiki/VAT_identification_number // https://taxation-customs.ec.europa.eu/vat-identification-numbers_en

SIREN: 9 digits(can be the same for multiple companies that are part of the same structure).

More info here: https://www.economie.gouv.fr

SIRET: 14 digits (made of 9-digit SIREN + 5-digit NIC)

More info here: insee.fr

DUNS (Data Universal Numbering System): standard business identifier made of 9 digits

More info here: https://developer.apple.com/support/D-U-N-S/ and here https://fr.wikipedia.org/wiki/Data_Universal_Numbering_System

QST ( Québec Sales Tax): Made of 16 characters long and consists of the following format:

UEN (Unique Entity Number for specific types of entities): the format depends on the year, you can check in the links

More info here: What is an UEN and here Everything you need to know about UEN

CRN (Company Registration Number): Made of an 8-character code with either 8 digits or 2 letters + 6 digits.

More info here: https://www.sumup.com/en-gb/invoices/dictionary/company-registration-number/

EIN: (Employer Identification Number): Made of 9 digits with the following format "XX-XXXXXXX"

More info here: https://en.wikipedia.org/wiki/Employer_Identification_Number