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Normally when you buy a static IPv4 address you get a single "1.2.3.4". OP is basically saying they have access to something like "1.2.[0-3].[0-255]". /22 is a fancy way of describing that kind of slice in CIDR notation. So they have 256*4=1024 IP addresses in total.

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> Normally when you buy a static IPv4 address you get a single "1.2.3.4"

Is it common to purchase (to own, not "rent" as what you get from cloud platforms) single IP addresses? I thought they were always bought/sold in blocks.

I should have said lease instead of buy, yes.

No, in general, the smallest block of IPv6 addresses you can "own" is /24. You have to pay yearly fees to your RIR (Regional Internet Registry) as an ANS (Autonomous system). Think of it as owning land and paying a land tax.

I have a /24 registered in the early 90's. I pay no registration fees for it since it's a legacy block.

I think it's 1022, as the first and last one in the block are the gateway and broadcast address, right?

That's the recommendation, yes, but even then all 1024 are in your control and you can do whatever you want with them.

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