If you know a hierarchy which is not listed in these pages or if you have more up-to-date information about an existing hierarchy, please send a mail to email@example.com or post to news.admin.hierarchies so that these pages can be updated.
A historic hierarchy is not entirely defunct, but it is very low-traffic, not widely read or carried, and may not be worth carrying. For most of them, no information is available, except a list of their hypothetical newsgroups.
You can display information about up to 30 hierarchies in the row by loading a web page of the form:
http://usenet.trigofacile.com/hierarchies/comp,humanities,misc,news,rec,sci,soc,talk.html (example for the Big 8).
Information in these pages comes from INN's control.ctl, ftp.isc.org newsgroups file, the list of PGP public keys for newsgroup administration and the logs of control messages.
Those external data are used to generate this web site. To report an issue about the generation, please use the issue tracker on GitHub or post to news.admin.hierarchies.
You might also want to read the Usenet hierarchy administration FAQ.