Internet background noise (IBN, also known as Internet background radiation) consists of data packets on the Internet which are addressed to IP addresses or ports where there is no network device set up to receive them. These noise packets normally contain unsolicited commercial or network control messages, or are the result of port scans and worm activities. The Conficker worm in particular is responsible for 70% of background noise generated by viruses looking for new victims. In addition to malicious activities, misconfigured hardware and leaks from private networks are also sources of background noise. For example, some DSL modems have a hard-coded IP address to look up the correct time. As the number of these modems grew, the amount of internet traffic they generated also increased.