This is more accurately the 100 oldest .com domains - Wikipedia's list (http://en.wikipedia.org/wiki/List_of_the_oldest_currently_re...) includes the list for the other TLDs. For example, it looks like 5 .edu domains were added at the same time as bbn.com was on April 24, 1985.
Even that list is incomplete, as it misses the country-code domains. For example, ucl.ac.uk was in DNS sometime in mid 1985 (http://domainincite.com/2657-was-this-the-first-ever-uk-doma...) But DNS registration wasn't the beginning of domain names - before DNS there was hosts.txt and some "new-style" domain names found their way in there before DNS.
This document ftp://ftp.maths.tcd.ie/src/mail/mmdf-Maths/doc/auth.ps from April 1985 by Steve Kille at UCL includes a server log (page 5) that lists hosts in cambridge.ac.uk, rsre.ac.uk, ukc.ac.uk, and rutherford.ac.uk in use all before the domain names were registered in DNS.
Disclaimer: I've had the same cs.ucl.ac.uk email address since I was a student in Sept 1985. Now I'm feeling old.
This document ftp://ftp.maths.tcd.ie/src/mail/mmdf-Maths/doc/auth.ps from April 1985 by Steve Kille at UCL includes a server log (page 5) that lists hosts in cambridge.ac.uk, rsre.ac.uk, ukc.ac.uk, and rutherford.ac.uk in use all before the domain names were registered in DNS.
Disclaimer: I've had the same cs.ucl.ac.uk email address since I was a student in Sept 1985. Now I'm feeling old.