namespace lookup for RDF developers

The intention of this service is to simplify a common task in the work of RDF developers: remembering and looking up URI prefixes.

You can look up prefixes from the search box on the homepage, or directly by typing URLs into your browser bar, such as or,dc,owl.ttl.

New prefix mappings can be added by anyone. If multiple conflicting URIs are submitted for the same namespace, visitors can vote for the one they consider the best. You are only allowed one vote or namespace submission per day.

This site is maintained by Richard Cyganiak. You can contact me via email. This site was developed at the Digital Enterprise Research Institute, which is part of the National University of Ireland, Galway. Bernard Vatant, Ruben Verborgh and Markus Lanthaler have helped to improve the site. The code is on Github.

DERI logo   NUI Galway logo

Further documentation