AFAIK if you use a DNS name of the host when you add it to an engine, then its IP could be changed as long as that name continue be resolved to the host new address.

On Wed, Dec 21, 2016 at 2:41 PM, Dan Kenigsberg <danken@redhat.com> wrote:
On Wed, Dec 21, 2016 at 12:41 AM, Bill Bill <jax2568@outlook.com> wrote:
> Hello,
>
>
>
> How can the IP of the hosts be changed? It is greyed out and I need to
> change those. It’s the only thing I’m not able to change..

I am afraid that you cannot change the address of the management
network while the host is attached to Engine. The reason is that
Engine always uses this address to communicate with the host.

You could change it only if you remove the host from Engine, modify
the address manually, and re-add the host using the new address.
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