You can verify the validity of a VAT number issued by any Member State of the European Union (EU) by selecting that Member State from the drop-down menu provided, and entering the number to be validated.

VIES (VAT Information Exchange System) is a search engine (not a database) owned by the European Commission. The data is retrieved from national VAT databases when a search is made from the VIES tool.

Retrievable data:
-Business Name
-Address
-Request Date
-Member State
-Vat number

This is an unofficial FREE app.

Official app : http://ec.europa.eu/taxation_customs/vies/