Log on Windows Server 2008 R2 by using Administrator account
Click Start menu and type Powershell
Right click on Powershell and then choose Run as Administrator
Type:
netsh DHCP server export C:\resolve\dhcp.txt
and then press Enter to export DHCP server to .txt file
Log on Windows Server 2016 by using Administrator account
Click Start menu and type Powershell
Right click on Powershell and then choose Run as Administrator
Type:
netsh DHCP server import C:\resolve\dhcp.txt
and press Enter to import .txt file
https://appuals.com/how-to-migrate-dhcp-from-windows-server-2008-r2-to-windows-server-2016/