//“點分十進制”字符串到數字的轉換
filter Convert-IP2Decimal
{
   ([IPAddress][String]([IPAddress]$_)).Address
}

//數字到“點分十進制”的轉換
filter Convert-Decimal2IP
{
([System.Net.IPAddress]$_).IPAddressToString
}

PS C:\Documents and Settings\Administrator> filter Convert-IP2Decimal
>> {
>>     ([IPAddress][String]([IPAddress]$_)).Address
>> }
>>
PS C:\Documents and Settings\Administrator>
PS C:\Documents and Settings\Administrator> filter Convert-Decimal2IP
>> {
>> ([System.Net.IPAddress]$_).IPAddressToString
>> }
>>

PS C:\Documents and Settings\Administrator> "192.168.0.1" | Convert-IP2Decimal
16820416
PS C:\Documents and Settings\Administrator> 16820416 | Convert-Decimal2IP
192.168.0.1
PS C:\Documents and Settings\Administrator>