It is not necessary to own a domain to connect a node to the Internet. DNS wasn't introduced until 1985, and as there was no domain sharks back then, there was really no rush to register.
Edit: DNS dates from 1983, the TLDs we know today from 1985.
"It is not necessary to own a domain to connect a node to the Internet."
Wow, really? I've managed to pick up a few facts while writing scripts for webpages and connecting my home PC to the information superhighway for all these years, but I must have missed that one. I guess you learn something new every day! Tell me: have you seen the place where the tubes are connected? Are there lots of valves?
Ahem.
The question is: why did symbolics feel the need to register a domain long before the web, and months before any of the other major players? It seems remarkably prescient, and I'm wondering why they registered it, despite the fact that it (obviously) wasn't mandatory.
Edit: DNS dates from 1983, the TLDs we know today from 1985.