How to View the DHCP Server Bindings or Leases on Cisco® IOS® Routers
When running DHCP server on Cisco routers and switches, administrators often want to view the database of DHCP leases or bindings. In order to view the current ip address leases, type “show ip dhcp binding” at the enable prompt. You will be presented with a table of ip address leases with columns which specify the ip address, the mac address, the lease expiration date, and the type of lease.
Router# show ip dhcp binding