My VPS provider is running a promotion where I can get up to 5 additional public IPv4 addresses for a one-time cost of $25 each. I have always only used a single public IP address per VPS. Would there be any advantage of having additional public IP addresses?
I know some people do not consider a VPS self-hosting, but this is the most relevant community I could think of and the question is also applicable for homelabs as well.
If your vps is a firewall, you could use it as an exit point for different private networks: ip1 to mask the traffic for a guest subnet that you don’t trust and if the ip gets blacklisted there are no issues for lan traffic behind ip2 while ip3 is reserved for server traffic with specific rulesets on supplier’s systems for updates/backup/whatnot. Should you have more than one mail server because of reasons, if one is blacklisted the other could remain clean (in this situation you usually put them on different subnets but whatever).