Get-LoopBack.ps1

1. <# 
2. .SYNOPSIS 
3.     This script checks whether a parameter is a Loopback Address  
4. .DESCRIPTION 
5.     This script checks to see if the passsed string is an IPV4
6.     or an IPv6 loopback address and if so, displays details.
7. .NOTES 
8.     File Name  : Get-LoopBack.ps1 
9.     Author     : Thomas Lee - tfl@psp.co.uk 
10.     Requires   : PowerShell Version 2.0 
11. .LINK 
12.     This script posted to: 
13.         http://www.pshscripts.blogspot.com  
14.     MSDN sample posted to: 
15.         http://msdn.microsoft.com/en-us/library/system.net.ipaddress.isloopback.aspx  
16. .EXAMPLE 
17.     PSH [C:\foo]: .\Get-LoopBack.ps1 
18.     Your input address: \127.0.0.1\ is an IPv4 loopback address whose internal format is: 127.0.0.1. 
19. .EXAMPLE 
20.     PSH [C:\foo]: .\Get-LoopBack.ps1 ::1 
21.     Your input address: \::1\ is an IPv6 loopback address whose internal format is: ::1. 
22. .EXAMPLE 
23.     PSH [C:\foo]: .\Get-LoopBack.ps1 131.107.2.200 
24.     Your input address: \131.107.2.200\ is not a loopback address. 
25. .PARAM 
26.     $IPAddress - Address to look up to see if it's Loopback 
27. #> 
28. param ( 
29. [String] $IpAddress = "127.0.0.1" 
30. )  
31. # Setup Default answer! 
32. $loopBack=" is not a loopback address."; 
33.  
34. # Perform syntax check by parsing the address string entered by the user. 
35. $Address = [System.Net.IPAddress]::Parse($IpAddress); 
36.  
37. # Perform semantic check by verifying that the address is a valid IPv4  
38. # or IPv6 loopback address.  
39. if([System.Net.IPAddress]::IsLoopback($Address) -and ($address.AddressFamily -eq [System.Net.Sockets.AddressFamily]::InterNetworkV6) ) { 
40.         $loopBack =  " is an IPv6 loopback address " + 
41.                     "whose internal format is: " + $Address.ToString() + "."; 
42. }            

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