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The third number 53 is significant because this number is the appropriate subnet for valid static IP Addresses. So if you had an IS&T issued static or properly registered DHCP machine in Building 4 it would be in the 18.53.*.* subnet pool.
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That would be all you console gamers on the Nintendo Wii, Playstation, and XBox, and users in the research areas with all the scientific wiz-bang doohickeys and apparatuses. You will need to contact IS&T either at computing-help@mit.edu or call the help desk at 3-1101 to have your device's MAC (Media Access Control) address registered.
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iPads, smartphones, and most tablets do NOT require registration. The only thing you need is to have valid Kerberos credentials on the device devices to access MIT Secure and MIT Secure N Wireless networks as well as other online administrative apps and library resources. There are some devices that skirt the line between smartphone/tablet and computer like the Windows Surface. If the device's networking doesn't seem to behave correctly initially internet-wise unregistered (and you have good WiFi signal strength), go ahead and register it and see if that fixes the problem.
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