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Mobility management in an IP network requires a location manager to identify the location of mobile host. Four mobility management schemes (SIGMA, Migrate, HIP and TCP- R) in the literature have proposed Domain Name Service as a location manager, with performance results available only for SIGMA. In this paper, we introduce a generic analytical model to compare the performance of DNS as location manager for all the four schemes. Our results shows that DNS is a feasible solution as location manager for all the four mobility management schemes; the performance, however, is better with SIGMA.