By December 5, 1969 the ARPANET consisted of four nodes:
1. University of California, Los Angeles (UCLA), where Leonard Kleinrock had established a Network Measurement Center.
2. The Stanford Research Institute's Augmentation Research Center, where Douglas Engelbart had created the ground-breaking NLS system, a very important early hypertext system.
3. University of California, Santa Barbara (UCSB), Culler-Fried Interactive Mathematics Center.
4. The University of Utah's Computer Science Department, where Ivan Sutherland had moved.