A technique for providing information derived from data traffic between a telecommunications network and the Internet is disclosed. The telecommunications network provides mobile Internet access to a plurality of mobile subscribers using IP addresses allocated to the mobile subscribers. Data packets in data traffic are analyzed at an interface between the telecommunications network and the Internet. Each analyzed data packet includes an IP address allocated to one of the plurality of mobile sub-scribers. For each of the analyzed data packets, a subscriber identity is retrieved based on the IP address included therein using an allocation function of the telecommunications network. The allocation function associates sub-scriber identities to IP addresses. Information derived from the analyzed data packets is stored in combination with the retrieved subscriber identities in a storing unit. An access interface for accessing the stored information is also provided.