Why do people feel that creating these lazy threads will help them get answers? You have a question, ok. Why put the template there? Why not expand on the question, give us an idea as to why you want to know the answer. Honestly, these lazy posts are getting more and more annoying.
How to tell if fiveM has blocked my server
When you connect, it will tell you. It’s literally that simple. FiveM won’t block your server unless you break the ToS (at least that’s the most common reason).
If you’re referring to why can’t you see the server on the list, then, use the search bar. There’s plenty of discussions on it and it’s most likely your fault.