| step | query | auth | servers |
| 1 | 121.216.155.66.in-addr.arpa. | . | (l,f,c,i,b,h,k,e,g,m,d,j,a).root-servers.net. |
| 2 | 121.216.155.66.in-addr.arpa. | in-addr.arpa. | (d,c,f,b,e,a).in-addr-servers.arpa. |
| 3 | 121.216.155.66.in-addr.arpa. | 66.in-addr.arpa. | (y,v,t,r,z,x,w,u).arin.net. |
| 4 | 121.216.155.66.in-addr.arpa. | 216.155.66.in-addr.arpa. | (ns2,ns3,ns1).paetec.net. |
We pick