Summary
ui.yahoo.co.jp has one IP number , which also has a corresponding reverse pointer.
yahoo.co.jp is a domain controlled by two nameservers on different IP networks. Incoming mail for
yahoo.co.jp is handled by four mailservers having a total of ten IP numbers. There are four duplicated IP numbers. Some of them are on the same IP network.
yahoo.co.jp has two IP numbers. They are on different IP networks.
ui.yahoo.co.jp is hosted on a server in Japan.