This is the most common "real" fake IP logger. The scammer sends you a link (e.g., grabify.link/XXXX). They claim it is a "Roblox script showcase." When you click it, you visit the Grabify link. Grabify logs your IP address and shows it to the scammer. The scammer then screenshots that and posts it as "proof" that his script works. In reality, he just tricked you into clicking a free IP logger link.
Even if the technical capability is fake, using scripts to threaten other players (e.g., "I have your IP") is considered harassment and bullying under Roblox community standards. fake ip logger troll script fe showcase roblox link
Even though the script is fake, the social engineering is real. Here is how to avoid becoming a victim: This is the most common "real" fake IP logger