| step | query | auth | servers |
|---|
| 1 | 220.28.4.199.in-addr.arpa. | . | (e,i,j,h,g,c,f,k,m,a,b,l,d).root-servers.net. |
| 2 | 220.28.4.199.in-addr.arpa. | in-addr.arpa. | (c,f,b,e,a,d).in-addr-servers.arpa. |
| 3 | 220.28.4.199.in-addr.arpa. | 199.in-addr.arpa. | (w,z,u,t,x,v,y,r).arin.net. |
| 4 | 220.28.4.199.in-addr.arpa. | 28.4.199.in-addr.arpa. | b.iana-servers.net. c.iana-servers.net. a.iana-servers.net. ns.icann.org. |
We pick 
