DHCP Leased Addresses show an IP in the name field.

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we have issue showed on our dhcp server. we've noticed 3rd octect above 128 not hand out dhcp address device. example scope 172.17.120.x leases addresses without issue, when go scope of 172.17.128.x below image , devices don't address assigned. we've restarted dhcp services, server itself, reconciled scope , tried re-creating scope no luck far. can see request go server server never sends device. there no a/v on server nor windows firewall turned on. insight appreciated. 

what network subnet mask , tell me if there many subnets..



Windows Server  >  Network Infrastructure Servers



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