TheForrester has published a list of the 100 oldest domain names on the internet. The top 6 date back to 1985 (I wonder how much they cost back then?). Here are the 5 oldest : symbolics.com, bbn.com, think.com, mcc.com and dec.com.
MCC.com doesn’t even seem to be loading for me 
Popularity: 10% [?]
