Your question seems to be a few mixed in. I’ll do my best to answer them.
In terms of leasing an IP or buying IPs, this is primarily done via an ISP. Typically a large business would contact an ISP and request an IP range, or sets of IPs.
In terms proxy IPs, it’s basically the same concept. Those proxy providers will say lease 10 IPs from an ISP. Then, their clients would configure their devices to use one of those 10 IPs.
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