Tainted IP Address? New Leases? IP Bans? How does it work

Hello,

So I've been trying to look around on Google before deciding to ask for your help here.

I was wondering how IP bans work if most IPs are assigned dynamically anyways, if someone were to get IP banned on IP address A, would it be tainted for it's new lease?

Or does every new IP address lease come as a clean slate? How do they keep track of this?

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Side question, I heard that you could change your IP address by chaning the MAC address of your modem or router? I'm not sure which it was, and then letting the DHCP lease renew. Is this accurate information?

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Thanks in advance,

TechieWasteLAN