The 100 oldest currently registered domain names includes such luminaries as IBM.com and Sun.com, although the oldest is for Symbolics.com.
Made me reminisce: the first website I visited back in 1994 was iii.net (now sadly registered to a holding company), back in the days before Singapore had commercial Internet providers and you had to use a Technet bug to telnet to other sites. It’s from those days, I think, that I ended up cited in the Mad About You FAQ. Ah, TV obsession.