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Summary: How to Tell an Airport from a Home:
Techniques and Applications
Andreas Pitsillidis
Yinglian Xie
Fang Yu
Martin Abadi
Geoffrey M. Voelker Stefan Savage
University of California, San Diego
Microsoft Research Silicon Valley
{apitsill,voelker,savage}@cs.ucsd.edu {yxie,fangyu,abadi}@microsoft.com
ABSTRACT
Today's Internet services increasingly use IP-based geolo-
cation to specialize the content and service provisioning for
each user. However, these systems focus almost exclusively
on the current position of users and do not attempt to infer or
exploit any qualitative context about the location's relation-
ship with the user (e.g., is the user at home? on a business
trip?). This paper develops such a context by profiling the
usage patterns of IP address ranges, relying on known user
and machine identifiers to track accesses over time. Our pre-
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