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.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
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+
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+x86/
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+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
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+# Visual Studio 2017 auto generated files
+Generated\ Files/
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+# MSTest test Results
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+project.fragment.lock.json
+artifacts/
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+# StyleCop
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+# Files built by Visual Studio
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+# Chutzpah Test files
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+# Visual C++ cache files
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+# Visual Studio profiler
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+# TFS 2012 Local Workspace
+$tf/
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+# Guidance Automation Toolkit
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+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
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+# NCrunch
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+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
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+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
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+# Paket dependency manager
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+paket-files/
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+# JetBrains Rider
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+__pycache__/
+*.pyc
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+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
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+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/

ARP-Scanner.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31912.275
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ARP-Scanner", "ARP-Scanner\ARP-Scanner.csproj", "{1616AA27-AEE0-48BD-8086-DB0B955BE42B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1616AA27-AEE0-48BD-8086-DB0B955BE42B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1616AA27-AEE0-48BD-8086-DB0B955BE42B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1616AA27-AEE0-48BD-8086-DB0B955BE42B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1616AA27-AEE0-48BD-8086-DB0B955BE42B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E6B80167-71E0-4048-BFE6-61DCBA463D87}
+	EndGlobalSection
+EndGlobal

ARP-Scanner/ARP-Scanner.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>ARP_Scanner</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="IPAddressRange" Version="4.2.0" />
+    <PackageReference Include="Stone_Red-C-Sharp-Utilities" Version="1.0.3.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="mac-vendors.csv">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

ARP-Scanner/ArpUtilities.cs

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+using Stone_Red_Utilities.ConsoleExtentions;
+
+using System.Net;
+using System.Runtime.InteropServices;
+
+namespace ARP_Scanner;
+
+internal class ArpUtilities
+{
+    [DllImport("iphlpapi.dll", ExactSpelling = true)]
+    private static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);
+
+    private uint macAddrLen = (uint)new byte[6].Length;
+
+    public string? SendArpRequest(IPAddress ipAddress)
+    {
+        byte[] macAddr = new byte[6];
+
+        try
+        {
+            _ = SendARP(BitConverter.ToInt32(ipAddress.GetAddressBytes(), 0), 0, macAddr, ref macAddrLen);
+            if (MacAddresstoString(macAddr) != "00-00-00-00-00-00")
+            {
+                return MacAddresstoString(macAddr);
+            }
+        }
+        catch (Exception e)
+        {
+            ConsoleExt.WriteLine(e.Message, ConsoleColor.Red);
+        }
+        return null;
+    }
+
+    public static string MacAddresstoString(byte[] macAdrr)
+    {
+        string macString = BitConverter.ToString(macAdrr);
+        return macString.ToUpper();
+    }
+}

ARP-Scanner/MacVendorLookup.cs

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+using System.Text.RegularExpressions;
+
+namespace ARP_Scanner;
+
+internal class MacVendorLookup
+{
+    public readonly string[] header;
+    private readonly string[][] fields;
+
+    public MacVendorLookup(string csvPath)
+    {
+        if (!File.Exists(csvPath))
+        {
+            header = Array.Empty<string>();
+            fields = Array.Empty<string[]>();
+            return;
+        }
+
+        string[] lines = File.ReadAllLines(csvPath);
+
+        header = lines[0].Split(',');
+        fields = lines.Skip(1).Select(l => Regex.Split(l, ",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))")).ToArray();
+    }
+
+    public string[] GetInformation(string macAdress)
+    {
+        string[]? data = fields.FirstOrDefault(f => macAdress.StartsWith(f[0]))?.ToArray();
+
+        if (fields.Length == 0 || header.Length == 0)
+        {
+            return Array.Empty<string>();
+        }
+        else if (data is null)
+        {
+            string[] result = new string[header.Length - 1];
+            for (int i = 0; i < result.Length; i++)
+            {
+                result[i] = "Unknown";
+            }
+            return result;
+        }
+        else
+        {
+            List<string> result = new List<string>();
+            for (int i = 1; i < header.Length; i++)
+            {
+                result.Add($"{data[i]}");
+            }
+            return result.ToArray();
+        }
+    }
+
+    public string[] GetHeader()
+    {
+        return header!.Skip(1).ToArray();
+    }
+}

ARP-Scanner/Program.cs

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+using ARP_Scanner;
+
+using NetTools;
+
+using Stone_Red_Utilities.CollectionExtentions;
+using Stone_Red_Utilities.ConsoleExtentions;
+
+using System.Collections.Concurrent;
+using System.Net;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        bool success = false;
+        IPAddress[]? ipAddresses = null;
+        MacVendorLookup macVendorLookup = new MacVendorLookup("mac-vendors.csv");
+
+        if (args.Length >= 1)
+        {
+            success = IPAddressRange.TryParse(string.Join("", args), out IPAddressRange iPAddressRange);
+            ipAddresses = iPAddressRange.AsEnumerable().ToArray();
+        }
+
+        if (!success || ipAddresses is null)
+        {
+            ConsoleExt.WriteLine("Invalid IP range!", ConsoleColor.Red);
+            return;
+        }
+
+        int ipAddressesCount = ipAddresses.Length;
+        int processedIpAddressesCount = 0;
+
+        List<string> header = new List<string>() { "IP", "MAC" };
+        ConcurrentBag<string[]> activeHosts = new ConcurrentBag<string[]>();
+
+        header.AddRange(macVendorLookup.GetHeader());
+
+        ConsoleExt.WriteLine("Starting scan...", ConsoleColor.DarkYellow);
+
+        Parallel.ForEach(ipAddresses, ipAddress =>
+        {
+            string? mac = new ArpUtilities().SendArpRequest(ipAddress);
+
+            Interlocked.Increment(ref processedIpAddressesCount);
+            if (mac is not null)
+            {
+                List<string> info = new List<string> { ipAddress.ToString(), mac };
+                info.AddRange(macVendorLookup.GetInformation(mac));
+                ConsoleExt.WriteLine($"Progress: {processedIpAddressesCount}/{ipAddressesCount} [{100d / ipAddressesCount * processedIpAddressesCount:0.00}%] | Active: {ipAddress}", ConsoleColor.Green);
+                activeHosts.Add(info.ToArray());
+            }
+            else
+            {
+                ConsoleExt.WriteLine($"Progress: {processedIpAddressesCount}/{ipAddressesCount} [{100d / ipAddressesCount * processedIpAddressesCount:0.00}%] | Inactive: {ipAddress}", ConsoleColor.Red);
+            }
+        });
+
+        if (!activeHosts.IsEmpty)
+        {
+            Console.WriteLine(Environment.NewLine + "Active hosts:");
+
+            List<string[]>? activeHostsTable = activeHosts.ToList();
+
+            activeHostsTable.Insert(0, header.ToArray());
+
+            To2D(activeHostsTable.ToArray()).PrintTable(TableStyle.List);
+
+            ConsoleExt.WriteLine($"{Environment.NewLine}Found {activeHosts.Count} active hosts", ConsoleColor.Green);
+        }
+        else
+        {
+            ConsoleExt.WriteLine($"{Environment.NewLine}No active hosts found", ConsoleColor.Red);
+        }
+    }
+
+    private static T[,] To2D<T>(T[][] source)
+    {
+        try
+        {
+            int FirstDim = source.Length;
+            int SecondDim = source.GroupBy(row => row.Length).Single().Key; // throws InvalidOperationException if source is not rectangular
+
+            T[,]? result = new T[FirstDim, SecondDim];
+            for (int i = 0; i < FirstDim; ++i)
+            {
+                for (int j = 0; j < SecondDim; ++j)
+                {
+                    result[i, j] = source[i][j];
+                }
+            }
+
+            return result;
+        }
+        catch (InvalidOperationException)
+        {
+            throw new InvalidOperationException("The given jagged array is not rectangular.");
+        }
+    }
+}

ARP-Scanner/Properties/launchSettings.json

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+{
+  "profiles": {
+    "ARP-Scanner": {
+      "commandName": "Project",
+      "commandLineArgs": "192.168.1.0 - 192.168.1.255"
+    }
+  }
+}

LICENSE

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+MIT License
+
+Copyright (c) 2021 Stone_Red
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# ARP-Scanner
+ A lightweight IP scanner