DNS delegation of 74.125.139 updated: May 20, 2013 4:42:00 PM
Delegation
step
query
auth
servers
1
139.125.74.in-addr.arpa.
.
(j,b,h,a,k,m,f,i,d,l,c,e,g).root-servers.net.
2
139.125.74.in-addr.arpa.
in-addr.arpa.
(a,f,d,e,b,c).in-addr-servers.arpa.
3
139.125.74.in-addr.arpa.
74.in-addr.arpa.
(z,u,w,x,y,t,v,r).arin.net.
4
139.125.74.in-addr.arpa.
125.74.in-addr.arpa.
(ns3,ns4,ns1,ns2).google.com.
We pick j.root-servers.net, one of the 13 root servers (1), and ask it about 139.125.74.in-addr.arpa and learn that in-addr.arpa is delegated to six name servers (2), so we ask a.in-addr-servers.arpa where we learn that 74.in-addr.arpa is delegated to eight name servers, including z.arin.net (3), so we ask that one and learn that 125.74.in-addr.arpa is delegated to four name servers (4), so we ask ns3.google.com and get the following answer: