How can I identify the ISP associated with an IP address in Go?

To determine the ISP of an IP address using IP2Location.io in Go, you can use the IP2Location.io API to retrieve geolocation and related data.

  1. We'll assume that you have already installed Go and we won't cover that here. You will also need a paid subscription to the Starter plan or higher. Subscribe now!
  2. In the command line, run the below command inside an empty folder to create the project.
    Bash 
    
go mod init example
  3. Save the below code into a file called example.go on your computer.
    Go 
    
package main

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
)

type ResultObj struct {
	Isp string `json:"isp"`
}

type ErrorObj struct {
	Error struct {
		ErrorMessage string `json:"error_message"`
	} `json:"error"`
}

func main() {
	var res ResultObj
	var ex ErrorObj
	var key = "YOUR_API_KEY"
	var ip = "8.8.8.8"

	myUrl := "https://api.ip2location.io?format=json&ip=" + ip + "&key=" + key
	resp, err := http.Get(myUrl)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusOK {
		bodyBytes, err := io.ReadAll(resp.Body)
		if err != nil {
			panic(err)
		}
		bodyStr := string(bodyBytes[:])
		if strings.Contains(bodyStr, "isp") {
			err = json.Unmarshal(bodyBytes, &res)
			if err != nil {
				panic(err)
			}
			fmt.Print("The ISP for IP " + ip + " is " + res.Isp + ".")
		} else {
			panic("ERROR: The isp field requires a paid subscription to the Starter plan or higher.")
		}
	} else if resp.StatusCode == http.StatusBadRequest || resp.StatusCode == http.StatusUnauthorized {
		bodyBytes, err := io.ReadAll(resp.Body)
		if err != nil {
			panic(err)
		}
		bodyStr := string(bodyBytes[:])
		if strings.Contains(bodyStr, "error_message") {
			err = json.Unmarshal(bodyBytes, &ex)

			if err != nil {
				panic(err)
			}
			panic("ERROR: " + ex.Error.ErrorMessage)
		}
	} else {
		panic("ERROR: Unable to call the API.")
	}
}
  4. In the command line, run the below command.
    Bash 
    
go run example.go

This script will output the ISP of specified IP address. 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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