How to get Local IP Address in Golang with example

How to get Local IP Address in Golang with example

This tutorial explains how to get a local IP address in Golang.

Usually, When you retrieved the IP address using golang API’s, gives a loopback address 12.0.0.1 configured in the/etc/hosts file, and does not give a local public outbound IP address such as 132.121.xxx.xxx.

How to get the Current Local outbound IP address in Golang

  • Written golang function that returns net.IP object
  • Created a connection by providing a GOOGle DNS server(8.8.8.8:80”) using a UDP connection instead of TCP.
  • The reason to use a UDP connection is, It does not connect to the target and does not apply handshake or connection
  • connect object getAddress method returns the IP address of the subnet IP address.
  • We can also get the ipaddress in CIDR notation

Here is an example

package main

import (
 "fmt"
 "log"
 "net"
)
// Local address of the running system
func getLocalAddress() net.IP {
 con, error := net.Dial("udp", "8.8.8.8:80")
 if error != nil {
  log.Fatal(error )
 }
 defer con.Close()

 localAddress := con.LocalAddr().(*net.UDPAddr)

 return localAddress.IP
}
func main() {

 ipString := GetOutboundIP()
 fmt.Println(ipString)

}