DNS delegation of vip.facebook.com updated: May 22, 2013 2:27:50 AM
Delegation
step
query
auth
servers
1
vip.facebook.com.
.
(k,g,l,f,e,j,a,m,i,d,c,b,h).root-servers.net.
2
vip.facebook.com.
com.
(a,e,h,d,k,m,g,j,f,i,l,b,c).gtld-servers.net.
3
vip.facebook.com.
facebook.com.
(a,b).ns.facebook.com.
4
facebook.com.
facebook.com.
(a,b).ns.facebook.com.
We pick k.root-servers.net, one of the 13 root servers (1), and ask it about vip.facebook.com and learn that com is delegated to 13 name servers (2), so we ask a.gtld-servers.net where we learn that facebook.com is delegated to two name servers, including a.ns.facebook.com (3), so we ask that one where we see a CNAME from vip.facebook.com to facebook.com, so we have to start all over again. We already know that a.ns.facebook.com is authoritative for facebook.com (4) and ask it about facebook.com and get the following answer: