Many experimental systems utilize OpenDHT but don't really care about its DHT-based architecture in practice. OpenLookup is an implementation of the same XML-RPC interface. Two rather different versions are available, v1 and v2.

OpenLookup V1

OpenLookup v1 is a centralized implementation based on Google App Engine.

This service is available at http://openlookup.appspot.com/ (on port 80).

OpenLookup V2

OpenLookup v2 is a standalone implementation (not based on App Engine) that utilizes a simple federated architecture based on full data replication.

The addresses of a few OpenLookup v2 nodes are published through round-robin DNS as any.openlookup.net. You can view a node status page and explore the network starting from http://any.openlookup.net:5851/.

The development of OpenLookup v2 was supported by TEKES through the Future Internet program of TIVIT (Finnish Strategic Center for Science, Technology, and Innovation in the field of ICT).