rc.yahoo.com

Delegation
Authoritative answer
Related hostnames

DNS delegation of rc.yahoo.com updated: May 24, 2013 10:26:04 AM

Delegation

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

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

Authoritative answer

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

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

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

Www.888yahoo.com, arnaldomedeiros.ymail.com, chinhdo.yhoo.it, search.yahoa.com, www.yahoosearch.in and at least 95 other hosts cnames to this hostname. This hostname cnames to rc.g01.yahoodns.net, sg-rc.g01.yahoodns.net and any-rc.a01.yahoodns.net. Newsyahoo.dk, yahoo-power.com, yahoocarparts.com, gamasyahoo.com, yahoodesktopsearch.net and at least 200 other hosts point to the same IP. Tw.rc.yahoo.com, au.rc.yahoo.com, cn.rc.yahoo.com, eur.rc.yahoo.com and nz.rc.yahoo.com are hosts under this domain. Rc.prgs.edu, rc.com.cn, rc.inf.br, rc.net.pl, rc.yale.edu and at least 63 other hosts are similar domain names.

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

Rc.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 the five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together (example: http-loginyahoo.com, baltimorehotjobs.com and espanolgeocities.com ).
Most of them use only the mail server . (example: yahoo-exploitz.com, yahoowidretengine.com and yourayahoo.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: login.yahoo.org, *.nivalis.yahoo.com.vn and m.yaho.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.

Two thirds of those point to IP group 1 (example: launch360.com, srdyahoo.com and yahoo-in.net ).
Two thirds of them use the name server ns5.yahoo.com (example: eros-yahoo.com, googleyahoo.com and yahoowin.net ).
Two thirds of them use the name server ns3.yahoo.com (example: withyahoo.com, yhahoomessenger.com and geociti8es.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 ns2.yahoo.com (example: hahoo.com, y-a-h-o-o.biz and yahoolocaltvlisting.com ).
Two thirds of them use the name server ns1.yahoo.com (example: lantinyahoochat.com, yahoohotjobs.us and yahoopers.com ).
Two thirds of them use the name server ns4.yahoo.com (example: yahoo.gy, yahoo-aimer.com and companionyahoo.us ).
The IP number 106.10.165.51
Every fifth of the several thousand of host names that point to the IP number 106.10.165.51 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: indag79.yahoo.com.mx, atbvietnam.yahoo.com.vn and leoferreira.ymail.com ).