How can I use an API to detect if an IP address is a VPN in Kotlin?

To detect if an IP address is a VPN using IP2Location.io in Kotlin, you can use the IP2Location.io API to retrieve geolocation and related data.

  1. We'll assume that you have already installed an IDE like IntelliJ that supports Kotlin and we won't cover that here. You will also need a paid subscription to the Security plan. Subscribe now!
  2. In your IDE, create a new Kotlin project. Then, add Kotlinx Coroutines Core and Gson into your project.
  3. Save the below code into a file called Test.kt on your computer.
    Kotlin 
    
import com.google.gson.*
import kotlinx.coroutines.*
import kotlinx.coroutines.future.await
import java.net.URI
import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse

@Throws(Exception::class)
fun main() {
    try {
        val ip = "8.8.8.8"
        val key = "YOUR_API_KEY"
        val url = "https://api.ip2location.io?format=json&key=$key&ip=$ip"
        val request: HttpRequest = HttpRequest.newBuilder().uri(URI(url)).GET().build()
        val client = HttpClient.newHttpClient()
        runBlocking {
            val response = client.sendAsync(request, HttpResponse.BodyHandlers.ofString()).await()

            val statusCode = response.statusCode()
            if (statusCode == 200) {
                val rawJSON = response.body()
                val myobj = JsonParser.parseString(rawJSON).asJsonObject
                if (myobj.has("proxy")) {
                    if (myobj.getAsJsonObject("proxy").get("is_vpn").asBoolean) {
                        println("The IP $ip is a VPN.")
                    } else {
                        println("The IP $ip is NOT a VPN.")
                    }
                } else {
                    throw Exception("ERROR: The is_vpn field requires a paid subscription to the Security plan.")
                }
            } else if (statusCode == 400 || statusCode == 401) {
                val rawJSON = response.body()
                if (rawJSON.contains("error_message")) {
                    throw Exception(
                        "ERROR: ${
                            JsonParser.parseString(rawJSON).asJsonObject.getAsJsonObject("error")
                                .get("error_message").asString
                        }."
                    )
                }
                throw Exception(rawJSON)
            } else {
                throw Exception(response.body())
            }
        }
    } catch (e: Exception) {
        println(e)
    }
}
  4. In the IDE, run the Test.kt file.

This script will check if the specified IP address is a VPN. Make sure to replace 8.8.8.8 with the IP address you want and replace YOUR_API_KEY to your own API key.

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