@@ -41,6 +41,7 @@ REPOSITORY_ROOT/
 │   ├── Create-FlagFromSVG.ps1        # Create flag images
 │   ├── Create-OUIListFromWeb.ps1     # Update OUI (MAC vendor) list
 │   ├── Create-PortListFromWeb.ps1    # Update port list database
+│   ├── Create-PublicSuffixListFromWeb.ps1  # Update public suffix list (RDAP: registered domain of a hostname)
 │   ├── Create-ReleaseTable.ps1       # Create the SHA256 sums / file table for release notes
 │   ├── Create-WhoisServerListFromWebAndWhois.ps1  # Update WHOIS servers
 │   ├── Create-WorldMapFromWeb.ps1    # Create the world map (Traceroute map)
 
@@ -0,0 +1,44 @@
+# Filepath in the resources
+[string]$OutFilePath = Join-Path -Path (Split-Path $PSScriptRoot -Parent) -ChildPath "Source\NETworkManager.Models\Resources\PublicSuffixList.dat"
+
+# Download the public suffix list (MPL 2.0) from publicsuffix.org
+$List = (Invoke-WebRequest -Uri "https://publicsuffix.org/list/public_suffix_list.dat").Content -split "[`r`n]+"
+
+# Keep the license notice, version and commit of the list
+$Header = $List | Where-Object { $_ -match "^// (This Source Code Form|License, v\. 2\.0|file, You can obtain|VERSION:|COMMIT:)" }
+
+# Only the ICANN section is used, since the private section (e.g. github.io) doesn't contain registered domains
+$IsICANN = $false
+$IdnMapping = New-Object System.Globalization.IdnMapping
+
+$Rules = foreach ($Line in $List) {
+    if ($Line -eq "// ===BEGIN ICANN DOMAINS===") {
+        $IsICANN = $true
+        continue
+    }
+
+    if ($Line -eq "// ===END ICANN DOMAINS===") {
+        break
+    }
+
+    $Rule = $Line.Trim()
+
+    if (-not $IsICANN -or [string]::IsNullOrEmpty($Rule) -or $Rule.StartsWith("//")) {
+        continue
+    }
+
+    # Rules are converted to A-labels (punycode), like the queries. Wildcard (*.) and exception (!) prefixes are kept.
+    $Prefix = if ($Rule.StartsWith("*.")) { "*." } elseif ($Rule.StartsWith("!")) { "!" } else { "" }
+
+    $Prefix + $IdnMapping.GetAscii($Rule.Substring($Prefix.Length)).ToLowerInvariant()
+}
+
+$Description = @"
+$($Header -join "`n")
+//
+// ICANN section of the public suffix list from https://publicsuffix.org/list/public_suffix_list.dat, with the
+// rules converted to A-labels (punycode).
+// Generated $(Get-Date) by Scripts/Create-PublicSuffixListFromWeb.ps1
+"@
+
+Set-Content -Path $OutFilePath -Value (@($Description) + $Rules) -Encoding utf8NoBOM
@@ -0,0 +1,38 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace NETworkManager.Converters;
+
+/// <summary>
+///     Convert a hostname to <see cref="bool" />: true if it has a domain (e.g. "server01.borntoberoot.net"), false for
+///     a single label like a NetBIOS name ("SERVER01").
+/// </summary>
+public sealed class HostnameHasDomainToBooleanConverter : IValueConverter
+{
+    /// <summary>
+    ///     Convert a hostname to <see cref="bool" />.
+    /// </summary>
+    /// <param name="value">Hostname as <see cref="string" />.</param>
+    /// <param name="targetType"></param>
+    /// <param name="parameter"></param>
+    /// <param name="culture"></param>
+    /// <returns>True if the hostname has a domain, otherwise false.</returns>
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        return value is string hostname && hostname.Trim('.').Contains('.');
+    }
+
+    /// <summary>
+    ///     !!! Method not implemented !!!
+    /// </summary>
+    /// <param name="value"></param>
+    /// <param name="targetType"></param>
+    /// <param name="parameter"></param>
+    /// <param name="culture"></param>
+    /// <returns></returns>
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}
@@ -0,0 +1,47 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using NETworkManager.Localization.Resources;
+using NETworkManager.Models.RDAP;
+
+namespace NETworkManager.Converters;
+
+/// <summary>
+///     Convert <see cref="RDAPQueryType" /> to an example input (watermark).
+/// </summary>
+public sealed class RDAPQueryTypeToWatermarkConverter : IValueConverter
+{
+    /// <summary>
+    ///     Convert <see cref="RDAPQueryType" /> to an example input (watermark).
+    /// </summary>
+    /// <param name="value">Object from type <see cref="RDAPQueryType" />.</param>
+    /// <param name="targetType"></param>
+    /// <param name="parameter"></param>
+    /// <param name="culture"></param>
+    /// <returns>Example input for the <see cref="RDAPQueryType" />.</returns>
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        return value switch
+        {
+            RDAPQueryType.Nameserver => StaticStrings.ExampleRDAPNameserver,
+            RDAPQueryType.TLD => StaticStrings.ExampleTLD,
+            RDAPQueryType.IPAddress => StaticStrings.ExampleIPAddressOrCIDR,
+            RDAPQueryType.ASN => StaticStrings.ExampleASN,
+            RDAPQueryType.Entity => StaticStrings.ExampleRDAPEntityHandle,
+            _ => StaticStrings.ExampleDomain
+        };
+    }
+
+    /// <summary>
+    ///     !!! Method not implemented !!!
+    /// </summary>
+    /// <param name="value"></param>
+    /// <param name="targetType"></param>
+    /// <param name="parameter"></param>
+    /// <param name="culture"></param>
+    /// <returns></returns>
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}
@@ -27,6 +27,9 @@ public static class ResourceManager
             Strings.Resource_ListTLD_Description),
 
         new("natural-earth-geojson", "https://github.com/martynafford/natural-earth-geojson",
-            Strings.Resource_NaturalEarth_Description)
+            Strings.Resource_NaturalEarth_Description),
+
+        new("Public Suffix List", "https://publicsuffix.org/",
+            Strings.Resource_PublicSuffixList_Description)
     ];
 }
@@ -378,4 +378,7 @@
   <data name="ExampleRDAPEntityHandle" xml:space="preserve">
     <value>ORG-RIEN1-RIPE</value>
   </data>
+  <data name="ExampleRDAPNameserver" xml:space="preserve">
+    <value>a.iana-servers.net</value>
+  </data>
 </root>
@@ -4830,4 +4830,31 @@ Cloudflare may log your IP address and network information. See Cloudflare's pri
   <data name="DeleteRulesX" xml:space="preserve">
     <value>Delete rules ({0})</value>
   </data>
+  <data name="RDAPQueryType_Auto" xml:space="preserve">
+    <value>Auto</value>
+  </data>
+  <data name="EnterValidRDAPQuery" xml:space="preserve">
+    <value>Enter a valid domain, IP address, AS number or entity handle!</value>
+  </data>
+  <data name="RDAPTimeoutAfterXSeconds" xml:space="preserve">
+    <value>The RDAP server did not respond within {0} seconds.</value>
+  </data>
+  <data name="RDAPQueryType_Nameserver" xml:space="preserve">
+    <value>Nameserver</value>
+  </data>
+  <data name="EnterValidNameserver" xml:space="preserve">
+    <value>Enter a valid nameserver (e.g., "ns1.example.com")!</value>
+  </data>
+  <data name="ASNumbers" xml:space="preserve">
+    <value>AS numbers</value>
+  </data>
+  <data name="RDAPDots" xml:space="preserve">
+    <value>RDAP...</value>
+  </data>
+  <data name="RDAPXIsNotARegisteredDomainShowingY" xml:space="preserve">
+    <value>"{0}" is not a registered domain, showing the registration data of "{1}".</value>
+  </data>
+  <data name="Resource_PublicSuffixList_Description" xml:space="preserve">
+    <value>List of public suffixes (e.g. "co.uk") from publicsuffix.org (MPL-2.0), which is used to get the registered domain of a hostname for RDAP queries.</value>
+  </data>
 </root>
@@ -15,6 +15,7 @@
         <None Remove="Resources\OUI.xml" />
         <None Remove="Resources\Ports.xml" />
         <None Remove="Resources\PSDiscoveryProtocol.psm1" />
+        <None Remove="Resources\PublicSuffixList.dat" />
         <None Remove="Resources\RDAPStealthEndpoints.json" />
         <None Remove="Resources\WhoisServers.xml" />
     </ItemGroup>
@@ -23,6 +24,7 @@
     </ItemGroup>
     <ItemGroup>
         <EmbeddedResource Include="Resources\PSDiscoveryProtocol.psm1" />
+        <EmbeddedResource Include="Resources\PublicSuffixList.dat" />
         <EmbeddedResource Include="Resources\RDAPStealthEndpoints.json" />
     </ItemGroup>
     <ItemGroup>