Help with rdns powershell script

This doesn't discard and should give you what you need.

get-content “C:\list\hnames.txt” |
    Select-Object @{n='IP';e={ $_ }}, @{n='Hostname';e={ [System.Net.Dns]::GetHostbyAddress($_) }} |
    Export-CSV C:\list\RDNS2.csv -NoTypeInformation

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Chris

is it possible to get both forward and reverse script?

i want to run a check of input file nomatter if its ip or hostname want this output

hostname/ip   FORWARD DNS CHECK
test1                 192.168.22.01
192.168            ts2

Sure, another pass can add that one on.

get-content "C:\list\hnames.txt" |
   Select-Object `
       @{n='IP';e={ $_ }},
       @{n='ReverseLookup';e={ [System.Net.Dns]::GetHostbyAddress($_).HostName }} |
   Select-Object *, @{n='ForwardLookup';e={ if ($_.ReverseLookup) { [System.Net.Dns]::GetHostEntry($_.ReverseLookup).AddressList } }} |
   Export-CSV C:\list\RDNS2.csv -NoTypeInformation

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Obviously we don't get to do the forward lookup on the result of the reverse unless the reverse lookup returned something.

Chris

Ahh sorry, you wish to to get reverse if it's an IP and forward if it's a name?

Get-content "C:\list\hnames.txt"  | ForEach-Object {
    try { $DnsCheck = [System.Net.Dns]::GetHostEntry($_) } catch { }
    if ($?) {
        if ([IPAddress]::TryParse($_, [Ref]$null)) {
           $DnsCheck = $DnsCheck.Hostname
        } else {
           $DnsCheck = $DnsCheck.AddressList
        }
    } else {
        $DnsCheck = $null
    }
      
    [PSCustomObject]@{
        'Hostname/IP' = $_
        'DNS Check'   = $DnsCheck
    }
} | Export-CSV C:\list\RDNS2.csv -NoTypeInformation

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Chris

so i'm impuitng ip's in my hnames.txt it should work right?

can it returned no reverselookip and no reverse forward lookup instead of leaving blank? possible

i got the below

IsReadOnly","IsFixedSize","IsSynchronized","Keys","Values","SyncRoot","Count"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collections.Hashtable+ValueCollection","System.Object","2"
"False","False","False","System.Collections.Hashtable+KeyCollection","System.Collect

Which version of PowerShell are you running? I rather assumed 4, but that isn't really consistent with 4.

This should be PowerShell 2 and above compatible. If so, you should be able to swap in you

Get-content "C:\list\hnames.txt" | ForEach-Object {
    try { $DnsCheck = [System.Net.Dns]::GetHostEntry($_) } catch { }
    if ($?) {
        if ([IPAddress]::TryParse($_, [Ref]$null)) {
           $DnsCheck = $DnsCheck.Hostname
        } else {
           $DnsCheck = $DnsCheck.AddressList
        }
    } else {
        $DnsCheck = $null
    }
    
    $Return = New-Object PSObject
    Add-Member 'Hostname/IP' -MemberType NoteProperty -Value $_ -InputObject $Return
    Add-Member 'DNS Check' -MemberType NoteProperty -Value $DnsCheck -InputObject $Return
    $Return
} | Export-CSV C:\list\RDNS2.csv -NoTypeInformation

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Chris

Ignore this bit: "If so, you should be able to swap in you", changed my mind about something :)

sounds good ill try to change the input file hostname what should i swap out promise thats last question

Hopefully it works. Either way the questions are not a problem :)

Chris