A Windows client is sending reverse lookup(PTR) requests frequently.
Any idea why?
They all seem to be to other DHCP clients and the pi-hole server IP
192.168.1.210 is pi-hole
192.168.1.211 is pi.hole
192.168.1.212 is pi.hole
That's an interesting question - but one for the developers or maintainers of the client software running on your Windows client that is issuing those reverse lookups. 
so Windows
Microsoft Support are not going to know what a PTR request is
an app on my pc, I left it running all day by accident
It get all network device IP and hostnames
so that would use PTR to get the hostnames
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