Query a DHCP server for a devices hostname

Hi, someone please help me.

I am looking for a way to 'ask' or 'query' my DHCP server for hostnames of devices on my local network. I know this is possible because it is how NTOPNG gets its hostnames (friendly names) of devices and also through mDNS. I have read almost every tutorial on the internet and they all come back to reverse dns and using DNS to find it. This is not suitable for my use case and I need to find it through the DHCP. PLEASE HELP ME :(

​

thanks guys