This document provides instructions for using a batch script to perform DNS lookups on a range of IP addresses. It describes creating a text file with one IP address per line, then using the nslookup command in a batch script to resolve the addresses, outputting successful and failed resolutions to separate log files. The purpose is to resolve the host names for a list of IP addresses.

1. Batch Script for nslookup range of IP Address
i | P a g e
Contents
Overview.......................................................................................................................................................1
Applies To......................................................................................................................................................1
Pre-requisites................................................................................................................................................1
DNS Search - Create......................................................................................................................................1
DNS Lookup – Test ........................................................................................................................................2
Create Batch script........................................................................................................................................2
Resolved IP Addresses ..............................................................................................................................3
Unresolved IP Addresses...........................................................................................................................3

2. Batch Script for nslookup range of IP Address
1 | P a g e
Overview
The purpose of this document is to resolve DNS for a range of IP Address.
Applies To
Windows Operating systems.
Pre-requisites
Any system running Windows OS, tested on windows 2008, Windows 2008 R2, Windows 8.1
DNS Search - Create
First thing that we create the IP range in a text file, and it should be one IP per line; as shown below.

3. Batch Script for nslookup range of IP Address
2 | P a g e
DNS Lookup – Test
To validate the result of the script, we will do a sample test of actual IP Address that gets resolved.
Create Batch script
Create a batch script file “iprange.cmd” and copy, paste the below script and save the file.
for /f %i in (ipslist.txt) do @nslookup %i 1>>nslookup-results.txt 2>>nslookup-errors.txt

4. Batch Script for nslookup range of IP Address
3 | P a g e
Resolved IP Addresses
All the resolved hosts would be stored in nslookup-results.txt file.
Note: Only the resolved IP address will be populated with Name of the host and IP address of the host
“Name:” and “Address:”
Unresolved IP Addresses
All the unresolved hosts would be stored in nslookup-errors.txt file.