Hi Robert,
Did you try it ?
It will not delete IPv4 (or IPv6), it will just override it with desired value. I didnt find a way how to delete it using "set host".
But using "dbedit" it is working like a charm:
dbedit
modify network_objects HOST_NAME ipaddr
update HOST_NAME
quit
or in case you need to delete IPv6:
dbedit
modify network_objects HOST_NAME ipaddr6
update HOST_NAME
quit
Please be aware, that after ipaddr or ipaddr6 there is one space character.
Kind regards,
Jozko Mrkvicka