updates-denied.kolo.net has one IP number , but the reverse is localhost. ns4.de, sunx.org, cabi.net, celox.nl, jcaa.com and at least 100 other hosts point to the same IP. kolo.net is a domain controlled by six nameservers. Two of them are on the same IP network. Incoming mail for kolo.net is handled by two mailservers on different IP networks.