Hey, it looked like a huge number back in 1980
. There were a whole 61 machines on the ARPANET (Internet predecessor) in 1975, and Vint Cerf and Bob Kahn had been banging the rocks together for about 2 years to try and create an internetwork linking SATNET, the Packet radio net, CSNET, and ARPANET when 1980 rolled around. Several hundred computers on some sort of internetwork! Yow!
The system didn't pass 10,000 machines until 1987. THEN it took off. 80,000 machines in January 1989, and 160,000 by November 1989. Folks gave up trying to make printed maps of the Internet.
Then Tim Berners-Lee got his NeXTCube and wrote his app to link physics papers together...