A small nitpick: They don't "own" these addresses, the regional internet registries (ARIN, RIPE, APNIC etc.) loan them to Amazon so they can use them, they could take them away again if AWS would do something that's against the RIRs' policies.<p>We also have a single /22 block of addresses from RIPE (we were one of the last companies to get such a block in 2019), so far we haven't made use of it though as it's still a bit tricky to find providers that will announce your addresses (without asking a hefty amount of money for it).