> In todays work once you give out a number you cant take it back This isn't true. If it were, then home ISPs would never renumber client networks. You're pro

> In todays work once you give out a number you cant take it back This isn't true. If it were, then home ISPs would never renumber client networks. You're probably thinking about the larger allocations handed to folks who have ASNs, rather than the small allocations handed small ISP customer sites... and even then, those can totally be reclaimed.