DNS delegation of com.edu updated: May 25, 2013 4:45:19 PM
Delegation
step
query
auth
servers
1
com.edu.
.
(m,e,f,h,b,g,a,c,i,d,k,j,l).root-servers.net.
2
com.edu.
edu.
(c,d,a,g,l,f).edu-servers.net.
3
com.edu.
com.edu.
ns1.swbell.net. ns1.com.edu.
We pick m.root-servers.net, one of the 13 root servers (1), and ask it about com.edu and learn that edu is delegated to six name servers (2), so we ask c.edu-servers.net where we learn that com.edu is delegated to two name servers, including ns1.swbell.net (3), so we ask that one and get the following answer:
Com.edu is a domain controlled by three domain name servers at att.net and com.edu having a total of five IP numbers. Two of them are on the same IP network. Incoming mail for com.edu is handled by one mail server at com.edu themselves. Com.edu has one IP number (65.69.204.16), but the reverse is com-webs-01.com.edu.