Status of the Neutrino Mass Experiment KATRIN

The KArlsruhe TRItium Neutrino experiment KATRIN is an international next-generation direct neutrino mass experiment, which will improve the current neutrino mass sensitivity in tritium decay by one order of magnitude. This report describes the status of hardware components and results of prototype measurements (supported in part by the German BMBF No. 5CK1VK1/7, 05CK1UM1/5 and 05CK2PD1/5).