PeerBlock – a software to block the network connections with computers and servers in the internet. When connecting PeerBlock searches the IP-addresses which are included to the blacklist because of the spread of viruses, advertising and unlicensed content. The software enables to use publicly available or created by the user lists to block dangerous IP-address. PeerBlock contains the tools to configure the blocked or permitted connections, notification of network events and works in the the hidden mode. PeerBlock also allows you to enable or disable the protection that is automatically afforded by the software.