Summary
att.yahoo.com has one IP number , via cname to
sbc.lga1.b.yahoo.com , but the reverse is
r1.reg.vip.re3.yahoo.com.
yahoo.sbc.com,
sbc.yahoo.com,
att..yahoo.com,
www.attyahoo.com,
rogers.yahoo.com and at least twelve other hosts point to the same IP.
starbrightaqusitions.com use this as a mailserver.
pop.att.yahoo.com,
www.att.yahoo.com,
smtp.att.yahoo.com,
search.att.yahoo.com and
comsmtp.att.yahoo.com are subdomains to this hostname.
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.
att.yahoo.com is hosted on a server in United States.