How to get external IPv4/IPv6 address in Go

You can use TechOverflow’s IPv4 HTTP API & IPv6 HTTP API within Go:

import (
    "io/ioutil"
    "net/http"
)

func GetExternalIPv4Address() (string, error) {
    // Perform request
    resp, err := http.Get("https://ipv4.techoverflow.net/api/get-my-ip")
    if err != nil {
        return "", err
    }
    // Cleanup when this function ends
    defer resp.Body.Close()
    // Read all the response data into a []byte
    body, err := ioutil.ReadAll(resp.Body)
    // Decode & print
    return string(body), nil
}

func GetExternalIPv6Address() (string, error) {
    // Perform request
    resp, err := http.Get("https://ipv6.techoverflow.net/api/get-my-ip")
    if err != nil {
        return "", err
    }
    // Cleanup when this function ends
    defer resp.Body.Close()
    // Read all the response data into a []byte
    body, err := ioutil.ReadAll(resp.Body)
    // Decode & print
    return string(body), nil
}

Usage example:

package main

func main() {
    v4, _ := GetExternalIPv4Address()
    v6, _ := GetExternalIPv6Address()
    println(v4)
    println(v6)
}

If you save both files in a directory named GoIPAddress, you can run

$ go build
$ ./GOIPAddress
31.190.168.110
2a03:4012:2:1022::1