Lunch command prompt window with "Run As Administrator" option (or the command will not work):
netsh dhcp server file://server_name/ scope 192.168.1.0 dump > rezervations.txt
To find a rezervation for speciefic MAC address:
netsh dhcp server \\server_nema scope 192.168.1.0 show reservedip | find "MAC-ADDRESS"
("MAC-ADDRESS" must include dashes)