Rader, An IP Logger / IP Grabber is usually when someone puts a link that looks.... wierd, e,g "Googe.com/blablabla/bla" Then, Once you click that suspicious link, It gets your IP and tells the person who sent you the link. Basicly
To make sure that you aren't being sent an "Ip logger" use this tool https://unshorten.it If the url leads to a url like google youtube or any big website it's most likely a IP logger you're welcome everyone.
This is how it works you are think you're going to "www.killyourself.pw" you are being lead to "https://www.dancraft.net/discussion/7194/whats-a-ip-logger#Item_15" when that happens you're IP is logged by the server "killyourself.pw" is harmless It just URL Forwarding you to this thread.