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TL;DR - they do not exist.
Long answer: I noticed that the most popular answer for this question claimed that there are such things as IPv7 and IPv9 addresses, but trust me - there is no such thing!
For those of you who don’t know, there are IPv6 addresses, which were created to solve the problem of running out of possible IP addresses. (The previous Internet Protocol was called IPv4.)
An IPv6 address looks like this: 2001:0db8:85a3:0000:0000:8a2e:0370:7334 - if you look up your IP address at WTF is my IP?!?!??, you will be able to see what yours is. (Note - there are other sites where you can do this; I just find that one funny.) The Wikipedia article on IPv6 explains a bit more about their structure and what each of the numbers means: IPv6 - Wikipedia
IPv7 addresses were proposed, but haven’t actually been created yet, so accessing them is literally impossible. The Internet Engineering Task Force (IETF) had written about such a thing (the proposal can be found at IPv7 Criteria Analysis for EIPIP), but this never came to fruition. They may have experimented with the technology as well, but this I’m not certain of. There is a clearnet site called IPv7.Net, but I suspect that this person just made the name up for fun.
As to the second part of your question, the same goes for .clos, .loky, .lll, .rdos, and whatever other fake domain names someone wants to come up with - they are not real. I suspect that the person who wrote the “top answer” above is the same person who runs this Tor hidden service: http://dafynex6ytjnpeo4.onion/ - it claims that you can download some software and be able to access these fictitious domain names. So I’m outing you, Mr. Scammer! Hopefully this person doesn’t try to take revenge on me.
My guess is that the software has some kind of malware in it, so if anyone did download it, I would check your computer immediately! I hope, for your sake, that you haven’t done any permanent damage to it.
Someone has also claimed (this may be the same person) that you can access these fake domain names using a VPN called ChaosVPN, which is a VPN designed to connect hackers and hackerspaces. The designers of this VPN are a group called Chaos Computer Club in Germany, and the VPN has nothing to do with accessing any B.S. web domains. In fact, they address this on the front page of their wiki: ChaosVPN - CCCHHWiki.
There are some private networks, however, for which the developers have created custom top-level domain names (TLDs) - one example would be cjdns (cjdelisle/cjdns ), for which they programmed a DNS hack and made their own domain name, .cjdns. This only applies to sites within the network, however - technically they aren’t “part of the internet,” so to speak. (Private networks are not considered to be part of the internet.) There are other private networks for which the developers have done something similar, like dn42.us and The Darknet Project - Team Cymru.
Some of this is rather complex to explain and would require a whole course on networking, but I’ve tried to sum it up the best I can. Suffice it to say that if someone offers you sketchy-sounding software to be able access a so-called “private domain name,” especially on Tor , stay away from it! I cannot stress this enough.
And if you do install such a program on your computer, I am not responsible for the consequences.
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