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The DHT-based locator/ID separation paradigm has been widely discussed to solve the serious scalability issue that today's Internet is facing. However, the identifier-to-locator mapping schemes have high resolution latency because each lookup need contact several servers in sequence, typically O(logN) hops. In this paper, we present a one hop DHT-based identifier-to-locator mapping service to achieve efficient flat identifier resolution. The analytic and simulation results show that in our proposed system the lookup latency is low and the bandwidth usage is reasonable.