How Can I Programmatically Determine My Router's Public IP Address?

Retrieving Your Public IP Address: A Practical Guide

Knowing your router's public IP address is essential for various network management tasks. However, directly accessing this information from your router isn't always straightforward. This guide explores effective methods.

C# Implementation

C# provides a clean solution for obtaining your external IP address:

<code class="language-csharp">using System.Net;
using System.Net.Http;

public static async Task<IPAddress> GetExternalIpAddress()
{
    string externalIpString = (await new HttpClient().GetStringAsync("http://icanhazip.com")).Replace("\r\n", "").Replace("\n", "").Trim();
    if (!IPAddress.TryParse(externalIpString, out IPAddress ipAddress)) return null;
    return ipAddress;
}</code>

Legacy C# Method

A less modern, but functional approach in C#:

<code class="language-csharp">using System.Net;

public static void Main(string[] args)
{
    string externalIpString = new WebClient().DownloadString("http://icanhazip.com").Replace("\r\n", "").Replace("\n", "").Trim();
    IPAddress externalIp = IPAddress.Parse(externalIpString);

    Console.WriteLine(externalIp.ToString());
}</code>

Command-Line Solutions

These cross-platform commands offer alternatives:

• wget: wget -qO- http://bot.whatismyipaddress.com
• curl: curl http://ipinfo.io/ip

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