How wide is the IP Range
here is a Statement from the SMF Manual
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Along with Track User, this page that can only be accessed by those allow to manage members. Here, you can track the member's current IP address (or type in a different one) and do things such as view whois records and view other members from the same IP/range. Also you can view messages posted at the IP/range entered and view errors caused by members from that IP/range as well.
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http://docs.simplemachines.org/index.php?topic=41
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Here's good read http://en.wikipedia.org/wiki/IP_address (http://en.wikipedia.org/wiki/IP_address)
Thank You
Road Rash
CM