| step | query | auth | servers |
| 1 | 10.239.171.69.in-addr.arpa. | . | (h,g,l,i,k,f,e,a,m,d,j,c,b).root-servers.net. |
| 2 | 10.239.171.69.in-addr.arpa. | in-addr.arpa. | (f,e,a,d,c,b).in-addr-servers.arpa. |
| 3 | 10.239.171.69.in-addr.arpa. | 69.in-addr.arpa. | (t,z,w,v,x,y,r,u).arin.net. |
| 4 | 10.239.171.69.in-addr.arpa. | 239.171.69.in-addr.arpa. | (b,a).ns.facebook.com. |
We pick