Router(config)#ip nat pool {netmask | prefix-length < prefix-length> }
router1(config)# no ip nat inside source static 160.10.1.2 169.10.1.2
router1(config)# ip nat pool pool1 169.10.1.50 169.10.1.100 netmask 255.255.255.0
router1(config)# ip nat inside source list 1 pool pool1
router1(config)# access-list 1 permit 160.10.1.0 0.0.0 .255