| step | query | auth | servers |
| 1 | 72.190.63.69.in-addr.arpa. | . | (c,i,e,j,l,b,a,m,k,f,d,h,g).root-servers.net. |
| 2 | 72.190.63.69.in-addr.arpa. | in-addr.arpa. | (c,e,b,a,f,d).in-addr-servers.arpa. |
| 3 | 72.190.63.69.in-addr.arpa. | 69.in-addr.arpa. | (r,x,u,v,w,z,y,t).arin.net. |
| 4 | 72.190.63.69.in-addr.arpa. | 190.63.69.in-addr.arpa. | (a,b).ns.facebook.com. |
We pick