1570-8705/$ see front matter 2012 Elsevier B.V http://dx.doi.org/10.1016/j.adhoc.2012.02.016 ⇑ Corresponding author. Tel. : +39 0461 40 84 00; fa E-mail addresses: daniele.miorandi@create-ne sabrina.sicari@uninsubria.it (S. Sicari), francesco.dep org (F. De Pellegrini), imrich.chlamtac@create-net.or The term ‘‘ Internet-of-Things’’ is used as an umbrella keyword for covering various aspects related to the extension of the Internet and the Web into the physical realm, by means of the widespread deployment of spatially distributed devices with embedded identification, sensing and/or actuation capabilities. Internet-of-Things envisions a future in which digital and physical entities can be linked, by means of appropriate information and communication technologies, to enable a whole new class of applications and services. In this article, we present a survey of technologies, applications and research challenges for Internetof-Things. 2012 Elsevier B.V. All rights reserved.