Good website for IP information and information related to ASNs. Regularly used to provide information which can support adding new blocks to a web application firewall or linux instance.
Best site for IP address related information. Clean, fast, ad free.
As for some that might be concerned about tracking, you give your IP to every website you visit, that is how it works, a request you make has to comeback to you - that is why you give your IP with your request. I used this for my school project, it was so easy to use it felt like cheating.