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A comment on Airlines Are Running Out of Flight Numbers, and They Don't Know What to Do. Parent comment

Re:Airlines Are Running Out of Flight Numbers, and They Don'... by BillTthree on Monday August 05, 2024 @11:30AM (#41162280)
there are a handful of ranges in IPv4 that are NOT globally unique. You're describing a much smaller set of IP ranges that are designed to be used+reused but not routable.

if you take someone elses public IPv4 address and they're using it, neither one of you will be functional, and they will come knocking on your door.

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Re:Airlines Are Running Out of Flight Numbers, and They Don'... by vel0city on Monday August 05, 2024 @11:34AM (#41162319)
> if you take someone elses public IPv4 address and they're using it, neither one of you will be functional, and they will come knocking on your door.

Sure, but if I have the IP address 1.2.3.4 I can have lots of unique physical things have that publicly routable IP address and have them all work if I do it right.

https://en.wikipedia.org/wiki/Anycast

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