I have recently started work for a new company. A few days ago, all the available IP addresses to Wifi clients ran out. I deleted all the leases so that people could connect again. A few days later it happened again. When I checked, I noticed something odd. There are two DHCP Scopes on two floors for Wifi clients but there were several phones, laptops and tablets that were listed with IP addresses in BOTH scopes. . My theory is when some Wifi clients get an IP on one floor, that IP is not released when the device moves to another floor or area of the building and gets a different IP address. Am I correct? Is this possible? How can it be rectified?