IP addresses that have been reserved for use by other servers,
such as DNS servers or mail servers can be unreserved.
On the top navigation
bar, click administration, then
click the ip addresses tab.
On the scope list,
that contains the IP addresses you want to unreserve. Only reserved IP
addresses can be unreserved.
Click list
addresses.
On the IP address
list, select the check box in the Select column
of the IP addresses you want to unreserve.
At the bottom of
the scope list, click Un-Reserve.
In the dialog box,
verify the IP addresses you are unreserving, then click OK.
The state of these IP addresses is shown as Available on the IP address
list.