There are well over 30,000 newsgroups in existence. Luckily they are organised into many hierarchies according to general topic.
The main hierarchies are:
In addition, many host systems carry newsgroups for a particular city, state or region. Indeed Cardiff University and the Dept of Computer Science have many newsgroups
cardiff.admin, cardiff.ga, cardiff.general, cardiff.gp-wales.announce, cardiff.gp-wales.binaries, cardiff.gp-wales.cme, cardiff.gp-wales.discussion, cardiff.gp-wales.dissemination, cardiff.gp-wales.test, cardiff.momed.test, cardiff.ncube, cardiff.pg.general, cardiff.pg.staff, cardiff.psych.general, cardiff.psych.it, cardiff.psych.part1, cardiff.psych.part2a, cardiff.psych.part2b, cardiff.test comsc.bsc2.ai, comsc.bsc2.c, comsc.bsc3.ai, comsc.bsc3.imgprc, comsc.msc.ai.vision