Is there a way for internal DHCP Scope to release scope addresses when the wifi client has disconnected?

DHCP scope is configured on a WLC 5508.
I'm checking if there' a way for WLC to clear the dhcp leasing when a user is diconnected from wireless?

Unless the client sends a DHCP Release upon disconnect, which is not mandaded in the protocol, the lease will simply remain until it has expired.  If you're concerned with running out of leases, you only have 2 options. 
1. reduce the lease time of your dhcp scope
2. increase the network size to accomodate more usable addresses.
There isn't a way to force a DHCP address lease to be "cleared" from the WLC simply because the client was disconnected.

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