This specification is derived from RFC 2396 [RFC2396], RFC 1808 [RFC1808], and RFC 1738 [RFC1738]; the acknowledgements in those documents still apply. It also incorporates the update (with corrections) for IPv6 literals in the host syntax, as defined by Robert M. Hinden, Brian E. Carpenter, and Larry Masinter in [RFC2732]. In addition, contributions by Gisle Aas, Reese Anschultz, Daniel Barclay, Tim Bray, Mike Brown, Rob Cameron, Jeremy Carroll, Dan Connolly, Adam M. Costello, John Cowan, Jason Diamond, Martin Duerst, Stefan Eissing, Clive D.W. Feather, Al Gilman, Tony Hammond, Elliotte Harold, Pat Hayes, Henry Holtzman, Ian B. Jacobs, Michael Kay, John C. Klensin, Graham Klyne, Dan Kohn, Bruce Lilly, Andrew Main, Dave McAlpin, Ira McDonald, Michael Mealling, Ray Merkert, Stephen Pollei, Julian Reschke, Tomas Rokicki, Miles Sabin, Kai Schaetzl, Mark Thomson, Ronald Tschalaer, Norm Walsh, Marc Warne, Stuart Williams, and Henry Zongaro are gratefully acknowledged.