hotmail.comwww.hotmail.co.uk and y4sminhotmail.comwww.hotmail.co.uk are subdomains to this hostname. hotmail.co.uk is delegated to three nameservers, however two extra nameservers are listed in the zone. All nameservers are at msft.net. All of them are on different IP networks. Incoming mail for hotmail.co.uk is handled by four mailservers having a total of twelve IP numbers. There are 36 duplicated IP numbers. Some of them are on the same IP network. hotmail.co.uk has one IP number.