When computers exchange data, they need each other's IP address. On the Internet, we often use third-party services such as Facebook, Twitter, Gmail or a marketplace. The exchange of data is routed via the third-party computers, rather than directly from sender to receiver. Some e-mail services send the IP address of the original sender from the message but these days, it's rare to get your hands on the originators IP address. Unfortunately, the owners of third-party services only hand over the IP address and related information to the police in case of a criminal police investigation. From society, we hear that it's often too much trouble for the police to request information from third parties. Hence, this web service.