Hi there!
I am new to this great tool and ecosystem...
I am trying to find out whether I could have a public static IP using Zrok...
The option of reserved shares sounds very close to that to me...
Am I right to think of it this way?
Hello back at ya, and welcome to zrok and the community 
I think you're on the right track, depending on what you need. If using the public zrok.io service (i.e., not self-hosting), the zrok reserve public ... -n SomeName will reserve a share that can be accessed at https://SomeName.share.zrok.io`.
The IP address users hit will be of the zrok public frontend. In the case of the zrok.io service, I believe there are currently 5 public frontends deployed, and users connect to whichever one is closest to them (via geo dns). If you are self-hosting you can of course deploy to a single static public IP address.
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Thank a lot for the response !
This was really helpful !
Yes I will be self-hosting for now...
I use:
zrok reserve public localhost:3000 --unique-name public_static_name
then
zrok share reserved public_static_name
and it works!!! 
With the same IP!!
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