Get My IP Golang

getip.go

package main

import (
    "net"
    "log"
    "os"
)

func main(){
    ifaces, _ := net.Interfaces()

    for _, i := range ifaces {
        addrs, err := i.Addrs()
        if err != nil {
            log.Panic(err)
        }
        for _, addr := range addrs {
            var ip net.IP
            switch v := addr.(type) {
            case *net.IPNet:
                ip = v.IP
            case *net.IPAddr:
                ip = v.IP
            }
            // process IP address
            os.Stdout.WriteString(string(ip) + "\n")
        }
    }
}

myip.go

package main

/*
URL: https://github.com/mccoyst/myip/blob/master/myip.go
URL: http://changsijay.com/2013/07/28/golang-get-ip-address/
*/

import (
	"net"
	"os"
)

func main() {
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		os.Stderr.WriteString("Oops: " + err.Error() + "\n")
		os.Exit(1)
	}

	for _, a := range addrs {
		if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil {
				os.Stdout.WriteString(ipnet.IP.String() + "\n")
			}
		}
	}
}