Perhaps a more interesting question, and one which I cannot quickly answer (nor am I going to go pinging huge swaths of the public internet), is are there any hosts in any version of HOSTS.TXT that are still on the public internet in the same location?  Or - and perhaps there is an easy answer to this that I do not know - is there a repository of old WHOIS databases?  I remember being stymied ~20 years ago that Ultrix had SRI-NIC.ARPA hardcoded in the whois binary and I couldn't find a hostname of the correct length with which to replace it...

-Henry