Nsupdate: is it possible to delete an entry in a dynamic zone by IP without knowing the domain name?

Question

linux

There is a script for updating ns records of several devices of the same type. When a vpn connection to the server is raised, the following is performed on the device:

function updatelan() {
echo "server $nsserver
        zone $domain
        update delete $HOSTNAME.$domain A
        update add $HOSTNAME.$domain. 1200 A $lan_ip
        show
        send" | nsupdate -k $key -v
}

those. first deletes the entry for our device, then add it with the current IP ($lan_ip).
Everything works, but there is a problem: in the dynamic zone there may be an entry with the same IP, but with a different name. Question: how to delete a record (or records) from a dynamic zone, knowing only ip?

Answer 1

Apparently in parallel it is necessary to lead the reverse zone. The reverse is where you get the name by IP.