Hi swabygw,
If your dev environment using host name http://localhost or http://127.0.0.1, then you can use the domain license for your product server and dev server both. If your dev environment has an actual domain name, then you can purchase a dev license from Adam@CuteSoft.net after you purchase the domain license, the dev license is same as the domain license, but will Cheaper than it. Also, you can use the trial license for the dev server, it valid for 30 days. And you can expand the trial from Kenneth@CuteSoft.net when you need it again, I will generate a new one for you.
Your product server and dev environment is not the same server and not using the same ip address, so the ip license only work for one of them.
Regards,
Ken