ro.bot.nu has one IP number. pl.us.to, bbr9.net, us.us.to, gov.us.to, baw.uk.to and at least 92 other hosts point to the same IP. a.ro.bot.nu, en.ro.bot.nu and irc.ro.bot.nu are subdomains to this hostname. bot.nu is a domain controlled by four nameservers at afraid.org. All of them are on different IP networks. Incoming mail for bot.nu is handled by one mailserver having a total of two IP numbers. They are on the same IP network. bot.nu has one IP number.