How to geolocate an IP using C# in .NET Framework

IP address geolocation can be crucial for many projects, useful for blocking potentially dangerous web traffic, providing shipping estimates, and gathering customer data, just to name a few. While setting up a geolocation function is by no means trivial, there is a much easier alternative that we will be looking at in today’s post: employing an API.

First, install the API client we will be using by running this command in the console of Package Manager:

Install-Package Cloudmersive.APIClient.NET.Validate -Version 1.2.7

Now we just have to call IPAddressPost:

using System;
using System.Diagnostics;
using Cloudmersive.APIClient.NET.Validate.Api;
using Cloudmersive.APIClient.NET.Validate.Client;
using Cloudmersive.APIClient.NET.Validate.Model;
namespace Example
public class IPAddressPostExample
public void main()
// Configure API key authorization: Apikey
Configuration.Default.AddApiKey("Apikey", "YOUR_API_KEY");
// Uncomment below to setup prefix (e.g. Bearer) for API key, if needed
// Configuration.Default.AddApiKeyPrefix("Apikey", "Bearer");
var apiInstance = new IPAddressApi();
var value = value_example; // string | IP address to geolocate, e.g. \"\". The input is a string so be sure to enclose it in double-quotes.
// Geolocate an IP address
GeolocateResponse result = apiInstance.IPAddressPost(value);
catch (Exception e)
Debug.Print("Exception when calling IPAddressApi.IPAddressPost: " + e.Message );

Let’s look at the output for this example IP address:

"CountryCode": "TW",
"CountryName": "Taiwan",
"City": "Taipei",
"RegionCode": "TPE",
"RegionName": "Taipei City",
"ZipCode": "",
"TimezoneStandardName": "Asia/Taipei",
"Latitude": 25.0478,
"Longitude": 121.5318

As you can see, a lot of useful information is given about the IP address in question.

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