SifIzm

This script will ping a Class B network(10.66.0.0/16) and put the responding 
IP address in a file called status.  The next part of the script reads the
status file and run a dig -x <IPADDRESS> +short.  We pipe the dig results 
to a file called dns.log.
#!/bin/bash
 # Write a shell to do a ping sweep and use the results with DIG
 # -------------------------------------------------------------------------
 # Copyright (c) 2011 Sif Baksh
 # This script is licensed under GNU GPL version 3.0 or above
 # -------------------------------------------------------------------------
 # This script is part of Sif Shell Script Collection (SSSC)
 # Visit http://sifizm.com/ for more information.
 # -------------------------------------------------------------------------
 #
 NETS="10.66"
 # bash while loop
 for NET in $NETS; do
 for n in $(seq 1 254); do
 A=${NET}.${n}
 for s in $(seq 1 254); do
 B=${A}.${s}
 ping -i 0.3 -w 3 ${B} -c 3
 if [ $? -ne 1 ]
 then
 echo "${B}" >> status
 fi
 done
 done
 done

# Test address to name to address validity
 echo
 echo -e "\taddress -> name -> address"
 echo '-------------------------------------'
 while read H; do
 HOST=$(dig -x $H +short)
 if test -n "$HOST"; then
 ADDR=$(dig $HOST +short)
 if test "$H" = "$ADDR"; then
 echo -e "ok\t$H-> $HOST -> $ADDR" >> dns.log
 elif test -n "$ADDR"; then
 echo -e "fail\t$H -> $HOST -> $ADDR" >> dns.log
 else
 echo -e "fail\t$H -> $HOST -> [unassigned]" >> dns.log
 fi
 fi
 done < status

Updated DNS script now it just ping all your internal Class B networks

and run the same dig commands.  Now the file name is dns-"${NET}"-log 

which means "${NET}" is the ClassB address of your choosing.
#!/bin/bash
# Write a shell to do a ping sweep and use the results with DIG
# -------------------------------------------------------------------------
# Copyright (c) 2011 Sif Baksh   <http://sifizm.com/>
# This script is licensed under GNU GPL version 3.0 or above
# -------------------------------------------------------------------------
# This script is part of Sif Shell Script Collection (SSSC)
# Visit http://sifizm.com/ for more information.
# -------------------------------------------------------------------------
#
NETS="172.25 172.31 10.66 10.67"
# bash while loop
for NET in $NETS; do
for n in $(seq 0 255); do
A=${NET}.${n}
for s in $(seq 0 255); do
B=${A}.${s}
ping -i 0.3 -w 3 ${B} -c 3
	if [ $? -ne 1 ]
	then
        HOST=$(dig -x $B +short)
                if test -n "$HOST"; then
                ADDR=$(dig $HOST +short)
                        if test "${B}" = "$ADDR"; then
                                echo -e "ok\t${B}-> $HOST -> $ADDR" >> dns-"${NET}"-log
                        elif test -n "$ADDR"; then
                                echo -e "fail\t${B} -> $HOST -> $ADDR" >> dns-"${NET}"-log
                        else
                                echo -e "fail\t${B}-> $HOST -> [unassigned]" >> dns-"${NET}"-log
                        fi
                fi
                                                        fi
                done
	done
done



                            

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