Step 1(Making hotzone data)

In the "DNSwalk" module, our system collects the following from DNS servers.
- DNS zone information and
- DNS version number 

12.in-addr.arpa.        172800  soa     cbru.br.ns.els-gms.att.net.  hostmaster.mail.att
.net. (
                        2       ;serial
                        86400   ;refresh
                        10000   ;retry
                        600000  ;expire
                        172800 )        ;minim
12.in-addr.arpa.        172800  ns      cbru.br.ns.els-gms.att.net.
12.in-addr.arpa.        172800  ns      dbru.br.ns.els-gms.att.net.
12.in-addr.arpa.        172800  ns      cmtu.mt.ns.els-gms.att.net.
12.in-addr.arpa.        172800  ns      dmtu.mt.ns.els-gms.att.net.
0.12.in-addr.arpa.      172800  ns      ns3.br.ns.els-gms.att.net.
0.12.in-addr.arpa.      172800  ns      ns4.mt.ns.els-gms.att.net.
0.12.in-addr.arpa.      172800  ns      ns5.mt.ns.els-gms.att.net.