DNS delegation of id.m.facebook.com updated: May 18, 2013 7:04:09 PM
Delegation
step
query
auth
servers
1
id.m.facebook.com.
.
(b,f,m,i,c,h,d,k,a,l,g,j,e).root-servers.net.
2
id.m.facebook.com.
com.
(k,f,h,c,d,a,l,m,i,b,e,j,g).gtld-servers.net.
3
id.m.facebook.com.
facebook.com.
(b,a).ns.facebook.com.
We pick b.root-servers.net, one of the 13 root servers (1), and ask it about id.m.facebook.com and learn that com is delegated to 13 name servers (2), so we ask k.gtld-servers.net where we learn that facebook.com is delegated to two name servers, including b.ns.facebook.com (3), so we ask that one and get the following answer: