| step | query | auth | servers |
|---|
| 1 | 25.23.245.210.in-addr.arpa. | . | (i,e,l,f,c,h,a,d,j,g,m,b,k).root-servers.net. |
| 2 | 25.23.245.210.in-addr.arpa. | in-addr.arpa. | (d,c,f,e,a,b).in-addr-servers.arpa. |
| 3 | 25.23.245.210.in-addr.arpa. | 210.in-addr.arpa. | ns4.apnic.net. sec1.authdns.ripe.net. apnic1.dnsnode.net. ns1.apnic.net. ns3.apnic.net. tinnie.arin.net. dns1.telstra.net. |
| 4 | 25.23.245.210.in-addr.arpa. | 23.245.210.in-addr.arpa. | (dns2,dns1).hcm.fpt.vn. |
We pick 
