Prefix delegation naturally follows physical hierarchy, keeping routing tables compact. Mandating something like a static /56 (physical location locked) to be

Prefix delegation naturally follows physical hierarchy, keeping routing tables compact. Mandating something like a static /56 (physical location locked) to be available at no extra cost if the customer asks for it, would work fine, though. I'd even accept requiring this only for contracts that allow more than one customer device to access the Internet simultaneously. Yes, a phone plan with two SIMs on one contract would already trigger this.