A hacker is someone who plays with technology for enjoyment but the term has become synonymous with cracker, a person that performs an illegal act. If you are worried about crackers (and you should if you use any Micro$oft products and the internet) perform an internet connection security analysis (of commonly probed ports) and then consider using a Mac.
IP Calculator takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. PHP Subnet Calculator - to install, just move PHP Subnet Calculator SubnetCalc.php into the webroot of a php capable webserver.
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