I remember back in the day when the highschool website & email was: school.district.k12.ca.us . Basically no one uses those because they were too long and hard to remember. My old school district doesn't use the higher level, the school doesn't use the full name. In fact, they don't even resolve in DNS anymore. Some districts now have the schools under their new domain, some schools do their own thing.

Huh, same! I remember the changeover happened sometime around fifth grade, so 2011-12 for our district? (Strangely enough our school's wifi used WEP until 2014ish. I remember the password was obviously contrived to the right length)

I never had a problem remembering such domains, because I found them logical. In fact, in 1996, I registered such a domain that was <street address>.<city>.<state>.us. I figured this was the most accessible one for all four of our roommates to use, and there was no cost at the time.

Come to find out that the k12.ca.us. domain is completely defunct! There is no SOA for it, and WHOIS indicates it's inactive. k12.ny.us. seems to be in the same condition. However, there are still k12.<state>.us. domains in other parts of these USA. If you search for them, you can find websites and email addresses under that hierarchy.

There are still plenty of subdomains, for example, https://www.cnusd.k12.ca.us/

The MBTA (transit authority) in MA in the US uses .com. (MA state government seemingly still uses .ma.us as well. And town.ma.us seems pretty standard in MA at least based on my town.

What are the chances that Art Spiegelman could register a clever "ma.us" domain?