DNS delegation of 136.40.151 updated: May 23, 2013 7:06:11 PM
Delegation
step
query
auth
servers
1
151.40.136.in-addr.arpa.
.
(f,l,g,d,c,j,e,h,i,a,m,k,b).root-servers.net.
2
151.40.136.in-addr.arpa.
in-addr.arpa.
(a,f,e,b,d,c).in-addr-servers.arpa.
3
151.40.136.in-addr.arpa.
136.in-addr.arpa.
(u,v,z,y,t,x,r,w).arin.net.
4
151.40.136.in-addr.arpa.
40.136.in-addr.arpa.
(extdns002,extdns001).ford.com.
We pick f.root-servers.net, one of the 13 root servers (1), and ask it about 151.40.136.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 136.in-addr.arpa is delegated to eight name servers, including u.arin.net (3), so we ask that one and learn that 40.136.in-addr.arpa is delegated to two name servers (4), so we ask extdns002.ford.com and get the following answer: