Which countries are supported?

Live validation covers all 27 EU member states plus Northern Ireland (XI), all through VIES. (Note: vatnode follows the VIES convention of EL for Greece, not the ISO GR.) The coverage reference breaks this down country by country — which ones return company details, registration date, legal form, industry, and a national registry identifier on top of the VIES verdict.

VAT-rate and format reference data covers a wider set of European countries, but number validation itself is EU-27 + XI only — see the next question for what's outside that scope.