Router1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Async65 unassigned YES NVRAM down down
FastEthernet0/0 unassigned YES NVRAM up up
FastEthernet0/0.1 172.25.1.5 YES NVRAM up up
FastEthernet0/0.2 172.16.2.1 YES NVRAM up up
Serial0/0 unassigned YES NVRAM up up
Serial0/0.1 172.25.2.1 YES NVRAM up up
Serial0/0.2 172.20.1.1 YES manual up up
FastEthernet0/1 172.22.1.3 YES NVRAM up up
Serial0/1 10.1.1.2 YES NVRAM up up
Loopback0 172.25.25.1 YES NVRAM up up
This output shows you all of your interfaces, their IP addresses, and both the interface and protocol status. The other two columns here are labeled "OK?" and "Method." "OK?" simply refers to whether the router thinks that interface is operating correctly, while "Method" indicates how the interface acquired its IP address.
Notice that the IP addresses of almost all of these interfaces were configured by NVRAM. This simply means that they have not changed since the last reboot. However, one of the interfaces, Serial0/0.2, was manually configured since the last reboot.