ENI number

Belgian vessel Talisman of Brecht, displaying ENI number
Dutch barge Stella Maris displaying ENI number

An ENI number (European Number of Identification or European Vessel Identification Number) is a registration for ships capable of navigating on inland European waters. It is a unique, eight-digit identifier that is attached to a hull for its entire lifetime, independent of the vessel's current name or flag.

ENI was introduced by the Inland Transport Committee of the United Nations Economic Commission for Europe in their meeting on 11–13 October 2006 in Geneva. It is based on the Rhine Vessel certification system previously used for ships navigating the Rhine, and is comparable to the IMO ship identification number.