#!/bin/bash
# nslookup-scan of IP-range

# It's possible to add more networks separated with space
NETS="192.168.0"

IPRange="1 254"
for NET in $NETS; do
  for n in $(seq $IPRange); do
        ADDR=${NET}.${n}
        echo "${ADDR},`nslookup ${ADDR} | awk -F "=" '{ print $2 }'|sed 's/^[ t]*//' | sed '/^$/d' | |sed 's/.$//'`"
  done
done

192.168.0.1,cba.infra.no
192.168.0.2,bca.infra.no
192.168.0.3,abc.infra.no
192.168.0.4,
192.168.0.5,
192.168.0.6,
192.168.0.7,
192.168.0.8,

3 thoughts on “nslookup-scan of IP-range/subnet”

1. #!/bin/bash
   # nsscan.sh
   # nslookup-scan of IP-range

   # Get subnets from arguments
   NETS=$@

   # Handle lack of arguments
   if [ “x$NETS” = “x” ]; then
   echo “Usage example: sh nsscan.sh 192.168.1”
   echo “This would scan 192.168.1.0/24”
   echo “Accepts class C subnets only”
   exit 2
   fi

   IPRange=”1 254″
   for NET in $NETS; do
   for n in $(seq $IPRange); do
   ADDR=${NET}.${n}
   # Only print line if nslookup returns a result
   if [ “x$(nslookup ${ADDR} | awk -F ‘=’ ‘{ print $2 }’| sed ‘s/^[ t]*//’ | sed ‘/^$/d’ | sed ‘s/.$//’)” != “x” ]; then
   echo “${ADDR} `nslookup ${ADDR} | awk -F “=” ‘{ print $2 }’|sed ‘s/^[ t]*//’ | sed ‘/^$/d’ | sed ‘s/.$//’`”
   fi
   done
   done

2. There’s an error in the regular expression :
   you must type
   sed ‘s/^[[:blank:]]*//’
   instead of
   sed ‘s/^[ t]*//’

   And there’s also a typo error :
   you must type
   | sed ‘s/.$//’
   instead of
   | |sed ‘s/.$//’

   1. OK, I have not tested this but I trust you :)

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