KPN-CERT is the Computer Security Incident Response Team from KPN. KPN-CERT proactively supports clients by guaranteeing the security of not only their company network but also the networks over which KPN offers its services. The consumer ISPs KPN Internet, Telfort and XS4ALL form part of this administered zone. Furthermore KPN-CERT collects and analyses data from incidents and can give advice on how to subsequently avoid them. This applies to incidents actively reported by clients in the administered zone, but also incidents precipitated by clients in the administered zone.