The normal command to set up a Network Address Translation (NAT) pool allows you to configure a single contiguous block of addresses in the pool.
However, it may be necessary to set up multiple non-contiguous blocks of addresses in the NAT pool.
To configure a NAT pool with non-contiguous blocks of addresses, issue the ip nat pool command, as shown in this example:
Router(config)#ip nat pool NAT prefix-length 24Router(config-ipnat-pool)#address 220.127.116.11 18.104.22.168Router(config-ipnat-pool)#address 22.214.171.124 126.96.36.199
For more information, refer to the More flexible pool configuration section of Cisco IOS Network Address Translation Overview.