IP address restrictions

I currently have a few ips on my server, and am going to be adding more soon. But I would like to restrict each ip to a certain user, so that I can have users with dedicated ips for whatever they want to host. Is this possible to do?
 
Create jails for each user, and assign an IP to each jail.

IPFW (and I believe PF) also supports the uid and gid options, for writing rules that only apply to locally generated packets, generated by that UID/GID.
 
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