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Can not think of any. Most of my servers are behind nat. You can return it to the ISP so they can give a VPS to another person
Maybe tunnel one of them to a Kimsufi dedi that can only have one ipv4, I don't know if that would work but I have been considering trying this in order to run proxmox without NAT on a Kimsufi. Probably not very useful but potentially fun if you are into this kind of thing.
For SEO its a plus when you have backlinks from uniques/different IPs.
In case you need to setup your own custom nameservers, each one can point to one individual IP (some Registrar's demand different Ips when setting up custom nameservers).
use one ip for public/production, and the other for management / development / playing around. make sure to setup firewall properly
So a use case I definetley see as @ScreenReader mentioned is having dual IP’s one for public acces and one for management. And then usually that management port wouldn’t even be publicly exposed but would only be accessible via a secure bastion host which then lets you connect to the second IP over a non-exposed LAN.
Although it's probably not worth using a second ip for this as you could just use wireguard or tailscale instead
This is wrong on so many levels
You can tunnel 1 of the IPs elsewhere with pure wireguard. Less complicated approach than if you have only 1 IP
The primary difference is the source address and how it's presented at remote hosts and visa versa. For applications that lack virtual hosts it gives the opportunity to use the same incoming port on both addresses. For remote applications that use IPv4 to do specifics one can orchestrate based on for example time to work around quotas. If you ask nicely sometimes providers can offer different routing based on the source address, eg to serve specific customers on X and Y. Ideas such as using containers with a specific IP to sandbox a role. It becomes really cool with Anycast, floating or different subnets.
I had a 1GB/1Core/50GB VPS from VirMach that came with two IPv4 and cost $1.3/year. Didn't have much use for it because I mostly host WordPress blogs and use CloudFlare so even 1 is enough.