DNS delegation of ptbsa.com updated: Jun 19, 2013 7:36:41 PM
Delegation
step
query
auth
servers
1
ptbsa.com.
.
(l,h,i,d,g,m,j,k,a,e,b,c,f).root-servers.net.
2
ptbsa.com.
com.
(h,k,g,d,f,l,e,b,c,i,m,j,a).gtld-servers.net.
3
ptbsa.com.
ptbsa.com.
(ns19,ns20).domaincontrol.com.
We pick l.root-servers.net, one of the 13 root servers (1), and ask it about ptbsa.com and learn that com is delegated to 13 name servers (2), so we ask h.gtld-servers.net where we learn that ptbsa.com is delegated to two name servers, including ns19.domaincontrol.com (3), so we ask that one and get the following answer:
