The three s ”Used IP addresses”, ”Dynamic IP ranges” and ”Locked IP ranges” contain the values administered by the IP management. You can use the ”Search” field to enter a search term (IP, network mask, MAC, group name or other client properties) to narrow down the number of values shown in the s. If you would like to remove the settings in one of the rows, check the box at the end of the corresponding row and click on ”remove” or use the ”remove” button at the end of the row.