Lookup reverse records of multiple IPs with Powershell
Here is a handy chunk of powershell code that uses the native windows command Nslookup to parse a list of IPs and output the IP and the reverse lookup value to a text file. This is especially usefull when you have a large number of IPs to check.
1 2 3 4 5 6 7 8 9 10 11 | $ips = Get-Content nslookup.txt $nslookupresults = "M:\Scripts\nslookupresults.txt" clear-content $nslookupresults Foreach ($ip in $ips) {$output = nslookup $ip|out-null #A DNS server can be defined here if ($output -match "name"){$ip | out-file $nslookupresults -append ($output -match "name")[0].remove(0,9) | out-file $nslookupresults -append "" | out-file $nslookupresults -append} } |
Tags: powershell
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Thanks Shay. I’m relatively new to Powershell and a lot of the things Ive written are wrapped around native Windows shell commands and WMI. Slowly dipping into the .NET classes
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Instead of using legacy apps, why not let PoSh and .NET do the work (and in a one-liner):
GC nslookup.txt | % {([System.Net.DNS]::GetHostByAddress($_)).AddressList} | Export-CSV “nslookup.csv” -NoTypeInformation -Force