Whois and reverse dns lookup provided by robtex


DNS delegation of mail.yahoo.com.vn updated:


2mail.yahoo.com.vn.vn.b.dns-servers.vn. f.dns-servers.vn. vn.cctld.authdns.ripe.net. a.dns-servers.vn. d.dns-servers.vn. e.dns-servers.vn. c.dns-servers.vn.
10src.g03.yahoodns.net.g03.yahoodns.net.yf1.yahoo.com. yf4.a1.b.yahoo.net. yf3.a1.b.yahoo.net. yf2.yahoo.com.
We pick h.root-servers.net, one of the 13 root servers (1), and ask it about mail.yahoo.com.vn and learn that vn is delegated to seven name servers (2), so we ask b.dns-servers.vn where we learn that yahoo.com.vn is delegated to two name servers, including ns1.yahoo.com (3), so we ask that one where we see a CNAME from mail.yahoo.com.vn to rc.yahoo.com, so we have to start all over again. We pick i.root-servers.net, one of the 13 root servers (4), and ask it about rc.yahoo.com and learn that com is delegated to 13 name servers (5), so we ask m.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns3.yahoo.com (6), so we ask that one and see a second CNAME from rc.yahoo.com to src.g03.yahoodns.net. We start over for the third time and we pick b.root-servers.net, one of the 13 root servers (7), and ask it about src.g03.yahoodns.net and learn that net is delegated to 13 name servers (8), so we ask i.gtld-servers.net where we learn that yahoodns.net is delegated to five name servers, including ns2.yahoo.com (9), so we ask that one and learn that g03.yahoodns.net is delegated to four name servers (10), so we ask yf1.yahoo.com and get the following answer:

Authoritative answer

ANSWER for mail.yahoo.com.vn.
mail.yahoo.com.vn.7200 CNAME rc.yahoo.com.
ANSWER for rc.yahoo.com.
rc.yahoo.com.300 CNAME src.g03.yahoodns.net.

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