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Anonymize IP (v4 and v6) in text file with Powershell

Manipulating Regex for IPv4 and IPv6 and replacing by fake IP address in a readed log file

Anonymize IP address in text file

Section titled “Anonymize IP address in text file”
Terminal window
# Read a text file and replace the IPv4 and IPv6 by fake IP Address




# Describe all variables
$SourceFile = "C:\sourcefile.txt"
$IPv4File = "C:\IPV4.txt"
$DestFile = "C:\ANONYM.txt"
$Regex_v4 = "(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
$Anonym_v4 = "XXX.XXX.XXX.XXX"
$Regex_v6 = "((([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}:[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}((b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b).){3}(b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b))|(([0-9A-Fa-f]{1,4}:){0,5}:((b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b).){3}(b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b))|(::([0-9A-Fa-f]{1,4}:){0,5}((b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b).){3}(b((25[0-5])|(1d{2})|(2[0-4]d)|(d{1,2}))b))|([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))"
$Anonym_v6 = "YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY"
$SuffixName = "-ANONYM."
$AnonymFile = ($Parts[0] + $SuffixName + $Parts[1])


# Replace matching IPv4 from sourcefile and creating a temp file IPV4.txt
Get-Content $SourceFile | Foreach-Object {$_ -replace $Regex_v4, $Anonym_v4} | Set-Content $IPv4File


# Replace matching IPv6 from IPV4.txt and creating a temp file ANONYM.txt
Get-Content $IPv4File | Foreach-Object {$_ -replace $Regex_v6, $Anonym_v6} | Set-Content $DestFile


# Delete temp IPV4.txt file
Remove-Item $IPv4File


# Rename ANONYM.txt in sourcefile-ANONYM.txt
$Parts = $SourceFile.Split(".")
If (Test-Path $AnonymFile)
{
    Remove-Item $AnonymFile
    Rename-Item $DestFile -NewName $AnonymFile
    }
    Else
    {
    Rename-Item $DestFile -NewName $AnonymFile
}