Use the following command to dsplay brief summary of interfaces

Router#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.1.2     YES manual up                    up
FastEthernet0/1            192.168.10.2    YES manual up                    up
FastEthernet1/0            unassigned      YES unset  up                    down
FastEthernet1/1            unassigned      YES unset  up                    down
FastEthernet1/2            unassigned      YES unset  up                    down
FastEthernet1/3            unassigned      YES unset  up                    down
...


To display only the configured interface, the same command can be used with little modification

Router#show ip interface brief | exclude unassigned
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.1.2     YES manual up                    up
FastEthernet0/1            192.168.10.2    YES manual up                    up
Router#

The above command with “include” keyword can be used to display interfaces which has no ip address assigned to them

Router#show ip interface brief | include unassigned
FastEthernet1/0            unassigned      YES unset  up                    down
FastEthernet1/1            unassigned      YES unset  up                    down
FastEthernet1/2            unassigned      YES unset  up                    down
FastEthernet1/3            unassigned      YES unset  up                    down
...