It appears that Eric Kuhnke <eric.kuhnke@gmail.com> said:
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I've seen a US based ISP do its internal management network reverse DNS using '.us' as a suffix, where the hierarchy is like POP name, then city/airport code, then state (eg: CA, NJ, FL), then .us for geographical location of equipment in USA.
For a long time, .US had an odd geographic structure invented by Jon Postel. Everything was <name>.<city>.<st>.us. There are also some special cases, notably k12.<st>.us for K-12 schools in each state. One could volunteer to be a local subregistrar and a fair number of us still exist. If you have a use for a domain name in watkins-glen.ny.us, just ask. In that era it was up to each subregistrar what to charge, and most of us charged and still charge nothing. Or check out my church's web site at unitarian.ithaca.ny.us. In 2002 the US government contracted with Neustar to run .US and since then it's been a lot like generic TLDs, with second level domains rented for a yearly fee. The old geographic names are still grandfathered but the registry, now run by Godaddy, isn't delegating any new ones. R's, John