Your IP address might be blocked on a website if you try logging in too many times or if you're suspected of being a spammer. You can wait 24 hours if the ban was temporary, or check to see if you've been blacklisted by checking a public list.
Why is my IP address blocked on some websites?
The most common scenario for getting blocked by your server is trying to log in too many times too quickly or with incorrect credentials. Most servers have a time limit placed for the number of login attempts.
Why am I being blocked from a website?
Websites get blocked when they detect an IP address that isn't supposed to access the restricted content. Your IP (Internet Protocol) address identifies your device on the internet and reveals your physical location. That's what lets websites find your IP and block (or allow) your device.