Configuration of one to one nat mapping and pool nat

ip nat inside source list 1 interface Serial0/0/0 overload
ip nat inside source static 172.18.0.109 204.8.1xx.xxx extendable
ip nat inside source static 172.18.0.108 204.8.1xx.xxx extendable
ip nat inside source static 172.18.0.107 204.8.1xx.xxx extendable
ip nat inside source static 172.18.0.106 204.8.1xx.xxx extendable
ip nat inside source static 172.18.0.105 204.8.1xx.xxx extendable
!
access-list 1 deny 172.18.0.108
access-list 1 deny 172.18.0.109
access-list 1 deny 172.18.0.106
access-list 1 deny 172.18.0.107
access-list 1 deny 172.18.0.105
access-list 1 permit 172.0.0.0 0.255.255.255