European Union Trademark Search System (EUTMS). The EU CN code query can use the EU trademark query system software. As of March 15, 2023, the software provides EU trademarks with starting and ending dates (application dates) from April 1, 1996 to March 15, 2023. The EU is headquartered in Brussels, the capital of Belgium. It was developed from the European Union. There are 6 founding member states, namely Germany, France, Italy, the Netherlands, Belgium and Luxembourg.