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Challenges of routing scalability has attracted many research efforts, represented by the works of splitting identifier and locator semantics of IP addresses. A group of identifier-locator (ID/Loc) split approaches is commonly featured with a mapping query service system, independent of the routing infrastructure. This is a significant change of the Internet routing architecture that deserves comprehensive analysis and quantitative evaluations. Focusing on the mostly concerned performance issues, we present a canonical model as the typical case where the mapping query is executed for routers performing the ID/Loc mappings, and then evaluate the behaviors of caching, query retrieval and queueing introduced by the query latency. According to the results, a well-defined mapping service is able to handle the traffic volume that a current big provider may experience. Furthermore, we also suggest an end system modification to get better performance in the age of ID/Loc having been split.