JSON-P service to determine if requestor is on/off campus using IPv4 address (written in PhP)
To install, simply place in a directory in which PhP scripts are allowed, then visit
isoncampus.php for instructions.
Place a file 'ipaddr.txt' in the current directory that follows the provided ipaddr-example.txt format. Fully expand each IPv4 address. Use http://www.subnet-calculator.com/cidr.php if necessary.