www.vn.yahoo.com

Delegation
Authoritative answer
Related hostnames

DNS delegation of www.vn.yahoo.com updated: May 23, 2013 7:39:19 AM

Delegation

step	query	auth	servers
1	www.vn.yahoo.com.	.	(a,j,i,g,e,k,h,f,m,d,l,b,c).root-servers.net.
2	www.vn.yahoo.com.	com.	(l,h,c,g,d,a,m,k,f,b,j,e,i).gtld-servers.net.
3	www.vn.yahoo.com.	yahoo.com.	(ns3,ns5,ns1,ns2,ns4).yahoo.com.
4	rc.yahoo.com.	yahoo.com.	(ns3,ns2,ns1,ns5,ns4).yahoo.com.
5	rc.g01.yahoodns.net.	.	(g,b,h,e,f,d,i,c,j,a,m,k,l).root-servers.net.
6	rc.g01.yahoodns.net.	net.	(e,b,h,j,l,d,f,i,m,c,g,k,a).gtld-servers.net.
7	rc.g01.yahoodns.net.	yahoodns.net.	(ns1,ns2,ns3,ns5,ns4).yahoo.com.
8	rc.g01.yahoodns.net.	g01.yahoodns.net.	(yf8,yf7,yf4,yf3,yf5,yf6,yf2,yf1).yahoo.com.
9	any-rc.a01.yahoodns.net.	yahoodns.net.	(ns3,ns2,ns1,ns5,ns4).yahoo.com.
10	any-rc.a01.yahoodns.net.	a01.yahoodns.net.	(yf1,yf2).yahoo.com.

We pick a.root-servers.net, one of the 13 root servers (1), and ask it about www.vn.yahoo.com and learn that com is delegated to 13 name servers (2), so we ask l.gtld-servers.net where we learn that yahoo.com is delegated to five name servers, including ns3.yahoo.com (3), so we ask that one where we see a CNAME from www.vn.yahoo.com to rc.yahoo.com, so we have to start all over again. We already know that ns3.yahoo.com is authoritative for yahoo.com (4) and ask it about rc.yahoo.com and see a second CNAME from rc.yahoo.com to rc.g01.yahoodns.net. We start over for the third time and we pick g.root-servers.net, one of the 13 root servers (5), and ask it about rc.g01.yahoodns.net and learn that net is delegated to 13 name servers (6), so we ask e.gtld-servers.net where we learn that yahoodns.net is delegated to five name servers, including ns1.yahoo.com (7), so we ask that one and learn that g01.yahoodns.net is delegated to eight name servers (8), so we ask yf8.yahoo.com and see yet another CNAME from rc.g01.yahoodns.net to any-rc.a01.yahoodns.net. We have yet again to start all over and we already know that ns3.yahoo.com is authoritative for yahoodns.net (9) and ask it about any-rc.a01.yahoodns.net and learn that a01.yahoodns.net is delegated to two name servers (10), so we ask yf1.yahoo.com and get the following answer:

Authoritative answer

ANSWER for www.vn.yahoo.com.
www.vn.yahoo.com.	1800	CNAME	rc.yahoo.com.
ANSWER for rc.yahoo.com.
rc.yahoo.com.	300	CNAME	rc.g01.yahoodns.net.
ANSWER for rc.g01.yahoodns.net.
rc.g01.yahoodns.net.	300	CNAME	any-rc.a01.yahoodns.net.
ANSWER for any-rc.a01.yahoodns.net.
any-rc.a01.yahoodns.net.	300	A	98.139.102.145

net. com. yahoo.com. yahoodns.net. vn.yahoo.com. rc.yahoo.com. ns5.yahoo.com. ns2.yahoo.com. yf6.yahoo.com. ns1.yahoo.com. ns4.yahoo.com. yf1.yahoo.com. ns3.yahoo.com. yf8.yahoo.com. yf5.yahoo.com. yf7.yahoo.com. yf3.yahoo.com. yf2.yahoo.com. yf4.yahoo.com. g01.yahoodns.net. a01.yahoodns.net. root-servers.net. www.vn.yahoo.com. gtld-servers.net. m.root-servers.net. a.root-servers.net. g.gtld-servers.net. e.gtld-servers.net. j.root-servers.net. i.gtld-servers.net. f.gtld-servers.net. m.gtld-servers.net. k.gtld-servers.net. h.root-servers.net. d.root-servers.net. d.gtld-servers.net. i.root-servers.net. h.gtld-servers.net. l.root-servers.net. k.root-servers.net. g.root-servers.net. b.gtld-servers.net. f.root-servers.net. c.gtld-servers.net. c.root-servers.net. a.gtld-servers.net. b.root-servers.net. l.gtld-servers.net. j.gtld-servers.net. e.root-servers.net. rc.g01.yahoodns.net. any-rc.a01.yahoodns.net.
whois net
whois com
whois yahoo.com
whois yahoodns.net
whois root-servers.net
whois gtld-servers.net

whois yahoo.com, yahoo.com
domain info api yahoo.com

Www.vn.yahoo.com has five IP numbers (77.238.178.122, 68.180.206.184, 106.10.165.51, 87.248.120.148, 98.139.102.145). All five of them are on different IP networks.

This hostname cnames to rc.yahoo.com, rc.g01.yahoodns.net, any-rc.a01.yahoodns.net and sg-rc.g01.yahoodns.net. Yahoo-grammy.net, myyahoomusica.com, mailingyahoo.com, yahoo-dickheads.com, yahoocamsluts.com and at least 200 other hosts point to the same IP.

Also check www.yahoo.com and yahoo.com.

Www.vn.yahoo.com is hosted on five servers in Sunnyvale, CA, United States.

The two IP numbers 68.180.206.184 and 98.139.102.145 together
There are several thousand of host names that point to the two IP numbers 68.180.206.184 and 98.139.102.145 together, hereafter referred to as "IP group 1".

Most of those use only the mail server . (example: yahoo1g.net, ywahoo.com and yahoo-flikr.com ).
Most of them use the five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together (example: toolsyahoo.com, yahoopersonals.us and mai8lyahoo.com ).
Five percent of them use the four name servers ns1, ns2, ns3 and ns5.yahoo.com together (but not ns4.yahoo.com ) (example: tlmdy.com, yahoo-algorithm-exposed.com and yahoofoxsport.com ).
The IP number 87.248.120.148
Most of the several thousand of host names that point to the IP number 87.248.120.148 point to the five IP numbers 68.180.206.184, 77.238.178.122, 87.248.120.148, 98.139.102.145 and 106.10.165.51 together (example: www.yahooologin.com, new.it.music.yahoo.com and www.btuyahoo.com ).

The IP number 98.139.102.145
There are several thousand of host names that point to the IP number 98.139.102.145.

Two thirds of those use the name server ns5.yahoo.com (example: 5to1.com, freedownloadingyahoo.com and xaahoo.com ).
Two thirds of them use the name server ns3.yahoo.com (example: yahoorecherche.com, espanoinyahoo.com and yahoopropertyfinder.com ).
Two thirds of them use the name server ns2.yahoo.com (example: gogleyahoo.com, yahoovietnam.net and yahoolagauns.com ).
The IP number 68.180.206.184
There are several thousand of host names that point to the IP number 68.180.206.184.

Half of those use the name server ns4.yahoo.com (example: agencyexchange.com, yahoogamnes.com and wwwyahoogames.com ).
Half of them use the name server ns1.yahoo.com (example: yahoo-cash.com, yahoolauunch.com and updateyahoo.com ).
Half of them point to IP group 1 (example: ayhooo.org, yahoolgians.com and nnyahoo.com ).
The IP number 77.238.178.122
More than one in eight of the several thousand of host names that point to the IP number 77.238.178.122 point to the four IP numbers 68.180.206.184, 77.238.178.122, 98.139.102.145 and 106.10.165.51 together (but not 87.248.120.148 ) (example: *.yahooaccounts.com, batam.yahoo.co.id and *.yahooail.com ).