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A comment on Reclaiming IPv4 Class E's 240.0.0.0/4. Parent comment

Re:Reclaiming IPv4 Class E's 240.0.0.0/4 by convolvatron on Monday May 27, 2024 @08:38PM (#40496231)
This was done so that networks could actually be renumbered to increase aggregation and routing efficacy. In todays work once you give out a number you cant take it back, and that leads to fragmentation (i.e. the swamp)
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Re:Reclaiming IPv4 Class E's 240.0.0.0/4 by simoncion on Tuesday May 28, 2024 @02:26AM (#40497919)
> 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.

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