DNS delegation of facebook.com.au updated: Jun 19, 2013 1:35:26 PM
Delegation
step
query
auth
servers
1
facebook.com.au.
.
(h,j,e,g,c,i,m,k,f,a,l,d,b).root-servers.net.
2
facebook.com.au.
au.
(o,m,l,b,n,s,v,a,p,r,u).au.
3
facebook.com.au.
com.au.
(x,w,z,y).au.
4
facebook.com.au.
facebook.com.au.
(a,b).ns.facebook.com.
We pick h.root-servers.net, one of the 13 root servers (1), and ask it about facebook.com.au and learn that au is delegated to eleven name servers (2), so we ask o.au where we learn that com.au is delegated to four name servers, including x.au (3), so we ask that one and learn that facebook.com.au is delegated to two name servers (4), so we ask a.ns.facebook.com and get the following answer:
The two name servers a and b.ns.facebook.com together
There are more than two hundred domains that use name server group 1.
Every fifth of those point only to the IP number 173.252.110.27. Worth noting is that half of the host names that point only to the IP number 173.252.110.27 use name server group 1.
Six of them use mail server group 1.
Six of them point only to the IP number 69.171.233.18.