I've created a few instances in google compute engine by using the web interface. I want to start doing it at the command line instead so that I can create more and automate the process. The web interface tells me what command I could use when creating an instance. I request a permanent public IP address, and I can see the command which works, but how do I know what addresses are available to request? For instance, let's stay I created serverA with the command "gcloud compute ... instances create "serverA" .. --address 18.104.22.168 ..." I reused an address I had been previously assigned, but I think I got lucky in that it worked, and I can't guess what other IP addresses to use when I want to create more instances on the command line. Is there a way to query for available addresses? Thank you.