| step | query | auth | servers |
| 1 | 21.34.239.216.in-addr.arpa. | . | (e,m,g,c,i,k,j,b,f,a,h,l,d).root-servers.net. |
| 2 | 21.34.239.216.in-addr.arpa. | in-addr.arpa. | (c,a,b,d,f,e).in-addr-servers.arpa. |
| 3 | 21.34.239.216.in-addr.arpa. | 216.in-addr.arpa. | (u,z,t,v,y,r,x,w).arin.net. |
| 4 | 21.34.239.216.in-addr.arpa. | 34.239.216.in-addr.arpa. | (ns1,ns4,ns3,ns2).google.com. |
We pick