The 10^th INET features a number of new tracks that reflect the millennial mood and the ascendancy of wireless technology, such as “Internet Science and Technology for the 21^st Century” and “Mobile Internet and IP Network Applications”. The plenary panel discussion, “The Future of the Internet Layer”, revisits a topic (among others) that sparked debate at INET ’92, in Kobe—the exhaustion of the IPv4 address space.