There are many examples; k12.<state>.us is another.
replyIt is (or was for a long time, IDK) a strongly recommended practice from ICANN. I imagine nearly all countries to do that.
replyThere end up being some weird edge cases where there are some countries which have both the equivalent of .co.uk but also allow registrations directly under the two-letter country code as well. .mx is one such case where most business are, e.g., costco.com.mx, but it’s also possible to register directly under .mx as well so Toyota Mexico is toyota.mx and not toyota.com.mx (the latter is registered, and ostensibly to Toyota, but the whois and nslookup records give very different results and the website doesn’t load when I try to visit it).
replyThis isn't so bad as .com.mx and .mx should be on the public suffix list then.
replyBut letting arbitrary customers take arbitrary 3 level domains, and others take 2 level domains, seems like a mistake as it's not very reasonable for every 3LD customer to put the 2LD on the public suffix list, but mixing 3LD and 2LD registrations means you can't public suffix *.name.
Seems the whole idea of having both was always misguided.
uk is one example - they opened up x.uk later, and gave x.co.uk registrations first dibs.
replyExcept nobody uses the .us tld, but pretty much every every Japanese company is on a .co.jp
replyIt used to be that only Japanese corporations could register a .co.jp while anyone else anywhere could register for a .jp. So I had several .jp domains registered through Gandi.net.
replyThe issue is that .jp registered outside of a few Japanese registrars are legally not allowed to offer Whois privacy.
The .us domain should’ve been universally useful for state and municipal governments, but most of those began registering directly under .gov, and not even in an orderly hierarchy under .st.gov
replyBut that was simply the easiest way to market your website as a trusted government entity. And now nobody has ever heard of .us domains in active use.
.us was primarily a hierarchy structure which in practice made confusing and hard to remember domain names, whereas .gov addresses hand out single domains which are generally easy to remember.
replySchools use it!
replyBased on my small sample of schools, all of the ones that were using locality based names under ca.us have migrated elsewhere, including to 2nd level domains under .us.
reply> Except nobody uses the .us tld
replyThis is a bug, not a feature.