Where can I buy a "white" IPv4 address "forever"?

Question

Computer networks

Let's say you need to set up equipment that may not be accessed for a long time (never again). It must send data to somewhere (even multiple locations) from anywhere that has a network.
Let's imagine that there is no way to update the hardware software (including remotely).
1. The domain is tied to a person, so you can expect that DNS will always send to the correct resource (but here it’s so-so).
2. You can take a VPS from a reliable provider, but I don't know if there are any guarantees of long-term assignment of IP to the client. I guess things can change depending on the circumstances.
3. Ideally, assigning an IP to a person, maybe other options ...
I know that addresses are issued by subnets and routes are needed for them, so the question was asked in order to find possible "cases" that do not occur to me.
The bottom line is that the piece of iron can always find "its" server.
Interested in all countries.
Maybe some VPS providers have guarantees for assigning IP addresses to the client?

Answer 1

Here is the scheme for issuing addresses on the Internet.
Addresses can theoretically be taken away from Provos, Provos themselves can die, so there is nothing eternal on earth.
VPS operators are also not eternal - the office and the paragraph will go bankrupt.
Let the device send data by domain name.
Or let the device tell who follows (by domain name) its current IP.
Or the device can bind its IP to a domain name using DDNS.
I would choose the first option.
The issue with a domain name is much easier to solve than with IP addresses - put 100,500 money into your account and your domain name for 10 years.
Now you turn off the device, for example, it is configured for IPv4, turn it on after 10 years, and there everything is already on IPv6 and the pros have already forgotten that once there was IPv4. And if you turn it on in 20 years, then IPv10 will already arrive in time there. Yes, no one connects via optics, but uses quantum data transfer and there are no IPs at all, and computers respond by name and patronymic. And in general, iron can stupidly not start.

Answer 2

What you need is called a PI address. To support it, you need a BGP session with an upstream ISP.

Answer 3

Where can I buy a "white" IPv4 address "forever"?

Nowhere.
Theoretically, you can buy the range of a certain office that once received it, but in my opinion, such ranges are bought by special buyers for rent - read specialized forums. Yes, and you will not be rented one or two IPs - there blocks go, starting from / 24, and this will be quite expensive.

Answer 4

This is very difficult, you need equipment with BGP support + get AS from the IANA service that just won't give it. It's easier to negotiate with one of the providers (probably make an agreement)
But it's better to "tie up" services by domain name and not worry about ip