High Quality Content by WIKIPEDIA articles! Panix is the third-oldest ISP in the world after NetCom and the World. Originally running on A/UX on an Apple Macintosh IIfx, Panix has gone through a number of transitions as the Internet has grown. It maintains a vibrant community of shell users and posters to its private panix.* USENET newsgroups. Panix also hosts regular get-togethers for fellow Panixistas in Central Park.