What error you get in the event log when you run ipconfig /registerdns ? Do you have any errors on the event log of the DNS server ? I have run IPCONFIG /REGISTERDNS which has started but it is not updating the records in the reverse zone.
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This option lets the client send its FQDN to the DHCP server in the DHCPREQUEST packet.
This enables the client to notify the DHCP server as to the service level it requires.
You, as a DHCP administrator, might want to enable DNS integration in order to automatically update the DNS records dynamically with the DHCP client computers’ information whenever the DHCP server assigns the IP address and other settings to them.
Since the DHCP server always assigns the dynamic IP addresses to the client computers which may change from time to time, and the DNS maintains the records of the information about the host names and their corresponding IP addresses, there must be some technology with the help of which the DNS server records can automatically get updated with the latest IP addresses that the DHCP server has assigned to the DHCP clients.