From Antiflux Wiki
evan provided the following explanation in July, 2004.
The first use of antiflux.org would have been shortly after I moved into Thunderbird in June 1998. At that time, it was only used as an internal domain for a couple of machines that lived under my desk. Externally, I used antiflux.ml.org.
Antiflux.org was first registered in January 1999, shortly after ml.org announced it would be ceasing operations. We acquired antiflux.ca, antiflux.net and antiflux.com over the next few years to achieve total TLD dominance.
Antiflux.org lived in my three rooms in Thunderbird and the iHoF server closet before the Merger. The exact configuration varied, but usually there was a firewall machine (486-something), a userhost (my Sparc classic), a file server (Pentium-266?) and a couple of other random machines hooked up. Antiflux.org machines ran OpenBSD, FreeBSD, some flavour of Linux (Slackware, then Debian, I believe) and Solaris.
antiflux.org and okcomputer.antiflux.org were separate machines until the official merger and move to Tera-Byte in December 2000.
/etc/passwd doesn't give you a exact record of who the first users were, but it's pretty close. On antiflux.org, it would have been me, x, cspencer, scottbro, mark, brendare, steve and holmes, as well as some people with accounts on both machines like grant, tim, tedmunds, ben, erin, michal and possibly others.