| step | query | auth | servers |
| 1 | 2.128.30.123.in-addr.arpa. | . | (c,e,g,k,a,f,h,i,j,m,l,b,d).root-servers.net. |
| 2 | 2.128.30.123.in-addr.arpa. | in-addr.arpa. | (a,d,c,f,e,b).in-addr-servers.arpa. |
| 3 | 2.128.30.123.in-addr.arpa. | 123.in-addr.arpa. | ns2.lacnic.net. sec1.authdns.ripe.net. ns1.apnic.net. apnic1.dnsnode.net. ns3.apnic.net. tinnie.arin.net. ns4.apnic.net. |
| 4 | 2.128.30.123.in-addr.arpa. | 30.123.in-addr.arpa. | (hcm-server1,vdc-hn01).vnn.vn. |
We pick