| step | query | auth | servers |
| 1 | 40.88.121.91.in-addr.arpa. | . | (l,c,g,h,m,b,f,d,a,e,j,k,i).root-servers.net. |
| 2 | 40.88.121.91.in-addr.arpa. | in-addr.arpa. | (e,a,c,d,f,b).in-addr-servers.arpa. |
| 3 | 40.88.121.91.in-addr.arpa. | 91.in-addr.arpa. | sec3.apnic.net. ns3.nic.fr. pri.authdns.ripe.net. tinnie.arin.net. sec1.apnic.net. sns-pb.isc.org. |
| 4 | 40.88.121.91.in-addr.arpa. | 88.121.91.in-addr.arpa. | (dns10,ns10).ovh.net. |
We pick