noc.tdc.se is a domain controlled by three nameservers at dns.tdc.se. Two of them are on the same IP network. nif.se, nll.se, sbc.se, sbu.se, kil.se and at least 21 other hosts share nameservers with this domain. tdc.se is a domain controlled by two nameservers at inet.tele.dk. They are on different IP networks. Incoming mail for tdc.se is handled by two mailservers at tdcsong.se. They are on the same IP network. tdc.se has one IP number.