ca.dal.net has eight IP numbers. All of them are on different IP networks. This hostname cnames to irc.dal.net. eu.dal.net, au.dal.net, us.dal.net, ix.dal.net, irc.get.no and at least 20 other hosts point to the same IP. ix.ca.dal.net are subdomains to this hostname. dal.net is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for dal.net is handled by one mailserver at dal.net themselves.