Getting IP address from MAC programatically is bit hard to program as ARP-level programming is needed. If one of the following condition is applied, you dont have to convert MAC to IP.
If you can change router or DHCP server configuration, you may be able to fix the IP address which will be always assigned to specific MAC address. This mean, the LXI instrument will have always the same IP address even if DHCP enabled.
If your LXI instrument supports hostname capability, you can VISA Open with hostname-based VISA address rather than IP address. This mean, you can use TCPIP::<hostname>::INSTR. You can use the same VISA address regardless what IP address is being assigned.
