In Germany for example you would have to speak to your ISP when changing the routers MAC or getting a new router. The routers MAC are bound to your ISP service.Quote:
There is nothing called "static router". A static IP address is assigned by the ISP and remains constant. It's not about the router itself, but how the isp leases out their ip ranges. In some situations the IP may appear static due to it being leased and locked to the router's MAC address. To change it, one might either modify the MAC address of the router or disconnect for an extended period until another user takes over the previous lease. Keep in mind that modifying the routers mac usually requires a custom setup with a custom router as the ones provided by the isp usually does not provide this functionality.
A free method which has worked great in the past is to call you ISP tell them you are working from home only and that your job requires you to used services like Amazon Works services (AWS) or Google cloud for dev ops work you do. And these services permanente blocked the public IP address you have been given by your ISP. You would tell them you have already spoken to the specific web service provider and the only way is for you to have another IP by your ISP.