"Major" primary and secondary references for contact information. When making updates, you should check all these locations for obsolete or incorrect information. Actually getting the owner/operator of all of these to make the changes is left as an exercise for the reader. Yes, I know I have some obsolete information around, and no I haven't figured out how to correct it everywhere. Autonomous System Number IPv4 Network Number IPv6 Network Number? Primary references whois.arin.net whois.ripe.net whois.apnic.net Secondary references whois.rsng.net whois.cw.net whois.ans.net (still answers) IN-ADDR.ARPA TXT records for some exchange points IN-ADDR.ARPA SOA records for some network numbers Maintainer Record Primary references whois.arin.net whois.ripe.net whois.rsng.net whois.cw.net whois.ans.net (still answers) Domain Name Primary references whois.crsnic.net many other registries, see SuperWhois tool Secondary references lots, see spam Name Server (Glue record) Primary references whois.crsnic.net many other registries, see SuperWhois tools Secondary references rare Other lists of contacts Exchange points http://nap.aads.net/nap.contacts.html http://www.paix.net/participants/paix-participants.htm Other lists http://puck.nether.net/netops/nocs.cgi -- Sean Donelan, Data Research Associates, Inc, St. Louis, MO Affiliation given for identification not representation