http://www.onlamp.com/pub/a/bsd/2006/08/24/ipfw-for-firewalls.html

72.214.22.181 = ns1

72.214.22.182 = ns2
72.214.22.183 = irev.net

72.214.22.184 = mail.irev.net, mail.kyogi.net, mail.castlejoe.com



iRev: .182 and .183