There is also the double barrelled but still active oz.au domain hierarchy - so good they named it twice! Back in the early Australian Internet days we admin'ed pegasus.oz.au for one of if not the first major national internet access networks in Australia.
Not a TLD such as .io, but In terms of Internet domain diasappearances, there is the legend that is fuckedgoogle.com, an anonymous economist's massive click-fraud expose of Google's business model and practices. The true reason for it's disappearance is made of legends and conspiriacies. See What Happened to fuckedgoogle.com for a tasty intro to the aftermath.
Privileged port is a trust belief system where you believe that the remote system only offers services below port 1024 if they were started with elevated privilege. Author PK Dick once said reality is that which, when you stop believing in it, doesn't go away.
I posit that the point of the video is that port changing is an inconvenience non-feature, especially at scale of distributed legitimate use.
been on my shelf for many years. i always thought the listed author's name was an insider joke nom de plume, because in english, the word "gerrymander" means to redefine electoral boundaries for political advantage.
historic & awesome telnet transcoded video clip
browser click here for maxed out telnet
or full screen your terminal and connect:
telnet 1984.ws
you can almost hear the audio stutters ...
Repo here or just click on link below
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Then there is Tuvalu's TLD .tv that generates around 8% of the country's total government revenue. Due to rising sea levels, the pacific atoll nation may not exist much longer.