Get IPs for a list of hostnames (nslookup)

$serverList= Get-QADComputer blah* | select name foreach ($server in $serverlist) { $IP= $([System.Net.Dns]::GetHostAddresses("$($")).IPAddressToString $Server | Add-Member -membertype noteproperty -name IPAddress -Value $IP #$IP=$null } $serverlist

$serverlist | where {$_.IPAddress -like "192.168.3.*"}

Get Subnet ID split IP Address

$ServerList = Import-Csv C:\scripts\AllServers.csv foreach ($Server in $ServerList) {     $Subnet=$null     $Subnet=($Server."IP Address").split(".")     #Lazy assuming class c set 4th octet to 0     $Subnet[3]=0     $Subnet = $Subnet -join "."     $Server | Add-Member -MemberType NoteProperty -Name "Subnet" -Value $subnet } 

$ServerList | select "device name", subnet | group -Property subnet

Stale DNS records

Count IP Address returned by dns

([System.Net.Dns]::GetHostAddresses("mypc")).count ([System.Net.Dns]::GetHostAddresses("")).count

Count only IPV4 Addresses

([System.Net.Dns]::GetHostAddresses("") | where {$_.AddressFamily -eq "InterNetwork"}).count

Count for each name in a list

$machinelist = "","","" foreach ($machine in $machinelist) { #Sometimes count does not return a value for the line bellow I don't understand why seems like  #it does not work if only 1 IP is returned #$DNSIPV4Count = ([System.Net.Dns]::GetHostAddresses($machine) | where {$_.AddressFamily -eq "InterNetwork"}).count $DNSIPV4Count = [System.Net.Dns]::GetHostAddresses($machine) | where {$_.AddressFamily -eq "InterNetwork"} | measure write-host $machine $DNSIPV4Count.Count }





Check-Host - modified to create an object instead of write-host

Why does my new object have extra blank lines that I don't want?

function Check-Host {     [CmdletBinding()]     Param(         [Parameter(Mandatory=$True, HelpMessage="Computer Name")][String]$ComputerName     )     $HostInfo = {} | Select "FQDN","IP Addresses","Pingable","WMI Computer Name","WMI Computer Domain",             "WMIOSInstallDate","MatchingNames","Uptime Text","Uptime"     $DNS = [System.Net.Dns]::GetHostByName($ComputerName)     $IPAddress = $DNS.AddressList[0].IPAddressToString     $Pingable=$(Test-Connection -Quiet -count 2 -ComputerName $IPAddress)     $HostInfo.FQDN = $($DNS.HostName)     $HostInfo."IP Addresses" = $($DNS.AddressList)     $HostInfo.Pingable = $Pingable     If($Pingable)     {         $WMIOS = Get-WmiObject -ErrorVariable WMIError -ErrorAction SilentlyContinue -Class win32_operatingsystem -ComputerName $IPAddress         #If there was no error running the previouse line (wmi connection) do this wmi connection too         If($?)         {             $HostInfo."WMI Computer Name" = $($WMIOS.CSName)             $HostInfo."WMI Computer Domain" = $(Get-WmiObject -Class win32_Computersystem -ComputerName $IPAddress).Domain             $Uptime = $WMIOS.ConvertToDateTime($WMIOS.LocalDateTime) - $WMIOS.ConvertToDateTime($WMIOS.LastBootUpTime)             $HostInfo.WMIOSInstallDate = (([WMI]'').ConvertToDateTime($WMIOS.InstallDate)).tostring()             $HostInfo."Uptime Text"= "$($Uptime.Days) Days $($Uptime.Hours) Hours $($Uptime.Minutes) Minutes"             $HostInfo.Uptime = $Uptime                      }         #Test if the original computer name matches the name returned by WMI at that IP address if so "True" otherwise         #return the WMI errer if it exists or False if not         $HostInfo.MatchingNames = IF ($ComputerName -eq $WMIOS.CSName)                  {$true}              ElseIf ($WMIError)             {                 $ErrorString = "$WMIError"                 If($ErrorString -like '*Access is denied*'){"WMI Error - Access is denied"}                 ElseIf($ErrorString -like '*OutOfMemoryException*'){"WMI Error - OutOfMemoryException"}                 ElseIf($ErrorString -like '*Server execution failed*'){"WMI Error - Server execution failed"}                 ElseIf($ErrorString -like '*RPC server is unavailable*'){"WMI Error - RPC server is unavailable"}                 ElseIf($ErrorString -like '*Not Found*'){"WMI Error - Not Found"}                 Else                  {                     #return the errorstring to MathingName variable and write the new WMI error to a log file                     $ErrorString                     #$WMIError | Out-File .\$($ComputerName)_error.txt                 }             }             Else {$false}     }     $HostInfo <#     .synopsis     quick health check on a host validate it is in DNS, Pingable and the Name of that machine      matches the input computername and checks host uptime .description     Check host .PARAMETER ComputerName     specify the Computer Name .example     Check-Host -ComputerName Server01 .example     Check-Host Server01 .Link #> }

Import remote modules

$ses = New-PSSession -ComputerName Server1 Import-Module DNSServer,DNSClient,NetTCPIP -PSSession $ses


DNS Querries

function Get-HostLookup {     [CmdletBinding()]     Param(         [parameter(Mandatory = $true)]         [string] $DomainName=$(throw '$DomainName is required')     )     $HostLookup= $([System.Net.Dns]::GetHostentry("$($DomainName)"))     Return $HostLookup }

View Client DNS Cache

Function Get-DNSClientCache{  $DNSCache = @()    Invoke-Expression "IPConfig /DisplayDNS" |  Select-String -Pattern "Record Name" -Context 0,5 |      %{          $Record = New-Object PSObject -Property @{          Name=($_.Line -Split ":")[1]          Type=($_.Context.PostContext[0] -Split ":")[1]          TTL=($_.Context.PostContext[1] -Split ":")[1]          Length=($_.Context.PostContext[2] -Split ":")[1]          Section=($_.Context.PostContext[3] -Split ":")[1]          HostRecord=($_.Context.PostContext[4] -Split ":")[1]          }          $DNSCache +=$Record      }      return $DNSCache  }

Test port access

try { 

    $socket = new-object Net.Sockets.TcpClient




catch [system.exception] {