DNS delegation of mobile.psu.edu updated: Jun 19, 2013 12:01:35 AM
Delegation
step
query
auth
servers
1
mobile.psu.edu.
.
(b,f,k,g,c,e,m,h,j,i,a,l,d).root-servers.net.
2
mobile.psu.edu.
edu.
(f,l,a,c,d,g).edu-servers.net.
3
mobile.psu.edu.
psu.edu.
psu-ns.acns.msu.edu. ns1.psu.edu. ns2.psu.edu.
We pick b.root-servers.net, one of the 13 root servers (1), and ask it about mobile.psu.edu and learn that edu is delegated to six name servers (2), so we ask f.edu-servers.net where we learn that psu.edu is delegated to three name servers, including psu-ns.acns.msu.edu (3), so we ask that one and get the following answer:
Mobile.psu.edu is a domain controlled by three domain name servers at msu.edu and psu.edu having a total of five IP numbers. Some of them are on the same IP network.