  Users and businesses are increasingly deploying Internet of Things (IoT)
devices at home, at work, and in factories. At the same time, we see an
increase in the use of IPv6 for Internet connectivity. Even though the IoT
ecosystem has been the focus of recent studies, there is no comprehensive
analysis of IoT end-hosts in the IPv6 Internet to date. In this paper we
perform an in-depth analysis of IPv6-reachable IoT hosts using active
measurements. We run measurements targeting 530M IPv6 addresses on six popular
IoT-related protocols. With 36.4K hosts in 156 countries we find 380x fewer
IoT-speaking end-hosts compared to IPv4. Moreover, we conduct a security
analysis for TLS-enabled IoT-speaking hosts identifying up to 57% untrusted
certificates, with up to 32% being self-signed and 25% being expired. Finally,
we plan to publish our measurement results, tools, and a website dashboard to
foster further research in the area.
