| step | query | auth | servers |
| 1 | 32.152.220.66.in-addr.arpa. | . | (l,e,i,d,h,m,k,j,c,f,g,a,b).root-servers.net. |
| 2 | 32.152.220.66.in-addr.arpa. | in-addr.arpa. | (d,b,f,c,e,a).in-addr-servers.arpa. |
| 3 | 32.152.220.66.in-addr.arpa. | 66.in-addr.arpa. | (y,x,t,r,z,v,u,w).arin.net. |
| 4 | 32.152.220.66.in-addr.arpa. | 152.220.66.in-addr.arpa. | (b,a).ns.facebook.com. |
We pick