History (1980-90s)
1983: UC Berkeley and BBN integrate TCP/IP into UNIX 4.2 BSD. Berkeley develops network utilities and sockets API.
1985-87: Decentralization of naming & addressing. NSF lets regional networks to connect to ARPAnet via a backbone, NSFnet.
1987-90: Companies join Internet. EBONE (Europe) connected to NSFnet. TCP improved to handle congestion by Van Jacobson.
1990-93: Steve Deering pioneers multicast and IPv6 work in IETF. Marc Andresson writes the first Mosaic browser.