Catalyzes the dephosphorylation of undecaprenyl diphosphate (UPP). Confers resistance to bacitracin. di-trans,octa-cis-undecaprenyl diphosphate + H2O = di-trans,octa-cis-undecaprenyl phosphate + H(+) + phosphate Bacitracin is thought to be involved in the inhibition of peptidoglycan synthesis by sequestering undecaprenyl diphosphate, thereby reducing the pool of lipid carrier available. Belongs to the UppP family. Was originally thought to be an undecaprenol kinase.