HKLM\SYSTEM\CurrentControlSet\Services\DhcpServer\Parameters
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0x0 - 0xFFFFFFFF minutes | 0x5A0 |
Determines how often the DHCP Service deletes expired ("doomed") records from the DHCP client information database. By default, records expire after four hours. Deleting expired records releases space for new IP addresses.