Question

What is ip logger and is it legal to use it

Answer 1

Answer:

IP Logger URL Checker allows to check URL for redirect and safety of the content. With IPLogger link expander service you can find a detailed information on the results of URL scan, including IP addresses of all servers involved in redirects, their geolocation and other information. ...

It is a tracking app

Answer 2

Answer:

They can freely use services like IP Logger or IP Tracker to keep tabs on your IP address. There's no specific law against that. But if they track your IP address for illegal purposes (harassment, stalking, DDoS-ing, cyber attacks, etc.), it obviously goes against the law.