You can buy a domain and set a custom IP via DNS. Spam coming... Spoiler I suggest https://www.namecheap.com/ It is cheap and have a great support, I had bought tons of domains there and I have never had any issue If you want a free alternative, you can get free subdomains in some websites or special free domains like dot.tk, but these kind of domains have some limitations, if your server has more than 200 users per day, you'll definitely need a better one.
Welcome to PMMP - the first thing you need to know is that there are a few things to avoid doing on these forums if you want to have a pleasant experience: using unnecessary formatting is one of them, asking questions without first looking for the answer is another, not providing enough information for people to understand the context is yet another. Also, as you've just discovered, creating duplicate threads for the same issue can get your threads deleted, or your account banned.