How do you know if you are permanently IP banned on Roblox?

When you go to the Roblox website, you will get a 403 Forbidden error. As some IP bans last for a week, you should go back to Roblox after 1 week to see if you received a permanent IP ban or a 1 week IP ban. If you still get a 403 Forbidden error, then you have been permanently IP banned on Roblox.