Summary
hidden-master.yahoo.com has one IP number , but the reverse is
localhost.
ns4.de,
umcn.nl,
sunx.org,
cabi.net,
celox.nl and at least 100 other hosts point to the same IP.
yahoo.com is delegated to five nameservers, however two extra nameservers are listed in the zone. All nameservers are at
yahoo.com themselves. All of them are on different IP networks. Incoming mail for
yahoo.com is handled by six mailservers having a total of eight IP numbers. Some of them are on the same IP network.
yahoo.com has three IP numbers. All of them are on different IP networks.