Summary
www.yahoomail.com ("Yahoo! Mail - Official site for the service, which features spam filters, a virus scanner, and interfaces for international users.") has one IP number , via cname to
rc.yahoo.com , but the reverse is
w2.rc.vip.re4.yahoo.com.
av.com,
yahoo.pk,
yahoo.sg,
yimg.com,
yahoo.ca and at least 100 other hosts point to the same IP.
yahoomail.com is a domain controlled by five nameservers at
yahoo.com. All of them are on different IP networks.
yahoomail.com has two IP numbers. They are on different IP networks.
www.yahoomail.com is ranked #3 world wide as
yahoo.com and is hosted on a server in United States. It is listed in
Computers/Internet/E-mail/Free/Web-Based/Y/Yahoo_Mail,
World/Arabic/إقليمـي/الشرق_الأوسط/السعودية/كمبيوتر/خدمات_البريد,
Computers/Internet/On_the_Web/Web_Portals and
Computers/Companies/Yahoo_Inc..Trustworthiness, vendor reliability, privacy and child safety of this site is excellent.
(more on reputation).