Get Tunnel Endpoint IP allocated?

I want to create an IPIP or VXLAN Tunnel from my ADC into the Pod CIDR. In order to do that, I need to configure an IP address from the Pod CIDR to my Tunnel Endpoint so I can route things correctly.

Is there a way to query an API or something to get a valid IP address assigned/allocated without just randomly picking one and hope nothing gets assigned that IP?? I have to think this problem has been solved, but I can’t find anything on the subject :frowning: