DNS delegation of 66.220.158 updated: May 24, 2013 12:50:20 AM
Delegation
step
query
auth
servers
1
158.220.66.in-addr.arpa.
.
(k,c,m,d,e,h,i,a,g,b,j,l,f).root-servers.net.
2
158.220.66.in-addr.arpa.
in-addr.arpa.
(e,b,f,c,d,a).in-addr-servers.arpa.
3
158.220.66.in-addr.arpa.
66.in-addr.arpa.
(r,v,x,z,t,y,w,u).arin.net.
4
158.220.66.in-addr.arpa.
158.220.66.in-addr.arpa.
(b,a).ns.facebook.com.
We pick k.root-servers.net, one of the 13 root servers (1), and ask it about 158.220.66.in-addr.arpa and learn that in-addr.arpa is delegated to six name servers (2), so we ask e.in-addr-servers.arpa where we learn that 66.in-addr.arpa is delegated to eight name servers, including r.arin.net (3), so we ask that one and learn that 158.220.66.in-addr.arpa is delegated to two name servers (4), so we ask b.ns.facebook.com and get the following answer: