How Can I Get My Router's Public IP Address Programmatically and via Command Line?

Retrieving Your Router's Public IP Address: A Comprehensive Guide

Knowing your router's public IP address is essential for various network tasks. However, directly determining this from within your local network can be challenging.

Here are several effective methods for obtaining this crucial information:

C# Solutions:

For asynchronous operations in C#, use HttpClient:

<code class="language-csharp">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>

A synchronous alternative using WebClient:

<code class="language-csharp">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 Methods (Linux & Windows):

Utilize wget for a concise solution:

<code class="language-bash">wget -qO- http://bot.whatismyipaddress.com</code>

Alternatively, employ the versatile curl utility:

<code class="language-bash">curl http://ipinfo.io/ip</code>

These methods provide reliable ways to retrieve your router's public IP address, regardless of your operating system or programming preference.

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