| step | query | auth | servers |
| 1 | 121.127.125.74.in-addr.arpa. | . | (k,l,g,b,j,d,c,m,e,h,a,i,f).root-servers.net. |
| 2 | 121.127.125.74.in-addr.arpa. | in-addr.arpa. | (c,e,b,d,f,a).in-addr-servers.arpa. |
| 3 | 121.127.125.74.in-addr.arpa. | 74.in-addr.arpa. | (v,z,u,y,t,r,w,x).arin.net. |
| 4 | 121.127.125.74.in-addr.arpa. | 125.74.in-addr.arpa. | (ns3,ns1,ns4,ns2).google.com. |
We pick