Detail map of Cambridge, Massachusetts, United States,Stanford, California, United States,Pittsburgh, Pennsylvania, United States,Urbana, Illinois, United States,Cleveland, Ohio, United States,Los Angeles, California, United States,Lexington, Massachusetts, United States,Salt Lake City, Utah, United States,Santa Barbara, California, United States,Mountain View, California, United States

A: Cambridge, Massachusetts, United States, B: Stanford, California, United States, C: Pittsburgh, Pennsylvania, United States, D: Urbana, Illinois, United States, E: Cleveland, Ohio, United States, F: Los Angeles, California, United States, G: Lexington, Massachusetts, United States, H: Salt Lake City, Utah, United States, I: Santa Barbara, California, United States, J: Mountain View, California, United States

The Arpanet has 15 Nodes

1971
ARPA NET, April 1971."  "Misc. Network Note #18. 7 June 71"
Image Source: digital2.library.ucla.edu
"ARPA NET, April 1971".  "Misc. Network Note #18. 7 June 71". UCLA Library Digital Collections > Network Measurement Center Collection.

In 1971 the ARPANET had 15 nodes (23 hosts).  They were: 

UCLA

Stanford Research Institute

University of California, Santa Barbara

University of Utah

Bolt, Beranek and Newman (Cambridge, Mass)

MIT

The Rand Corporation (Santa Monica)

Software Development Corporation (Santa Monica)

Harvard

Lincoln Laboratory (Lexington, MA)

Stanford

University of Illinois at Urbana-Champaign

Case Western Reserve University

Carnegie Mellon University

NASA/Ames Research Laboratory.

Timeline Themes

Internet & Networking