Short for Internet Experiment Notes, a series of documents similar to RFCs concerning the early experimental work in TCP and IP. In 1977, ARPA began organizing and financing a research project to build an Internet based on the work done by Bob Kahn and Vint Cerf in 1974. Led by the Internet Working Group, the project needed a way to share technical notes and created IENs so that they wouldn t be confused with ARPANET s RFCs.
