The structure of the name tree

Four countries in Europe have choosen to have domains like AC, CO, GOV, etc. below the country top level domain: Austria, Belgium, Israel and United Kingdom. All the others have choosen to have organization names below the top level domain. Another interesting result is the depth of the SOA records owner (name), minimum and maximum is respectively 1 for Bulgaria and former Soviet Union, and 6 for Sweden (``adm.hj.se.adm.hj.se'', ``tekn.hj.se.tekn.hj.se'' and ``uki.hj.se.uki.hj.se'' – this seems to be a missing trailing dot!).