Golang : Get the IPv4 and IPv6 addresses for a specific network interface
Problem:
You need to find the IP address of a specific network interface on your machine for developing your application. Perhaps your machine has couple of network interfaces and your application needs to use a specific interface for security reason.
How to find the IP address either version 4 or 6?
Solution:
Use net
package Interfaces()
function. Below is an example of how to use the Interfaces()
to find out the available interfaces and then specify a network interface by name to list out the IP addresses.
NOTE : This example will enumerate all the available network interfaces. If you need to specify a particular interface on your machine, first find out the interface name and then plug in the name in net.InterfaceByName("name")
.
Here you go!
package main
import (
"fmt"
"net"
)
func main() {
// get available network interfaces for
// this machine
interfaces, err := net.Interfaces()
if err != nil {
fmt.Print(err)
return
}
for _, i := range interfaces {
fmt.Printf("Name : %v \n", i.Name)
byNameInterface, err := net.InterfaceByName(i.Name)
if err != nil {
fmt.Println(err)
}
//fmt.Println("Interface by Name : ", byNameInterface)
addresses, err := byNameInterface.Addrs()
for k, v := range addresses {
fmt.Printf("Interface Address #%v : %v\n", k, v.String())
}
fmt.Println("------------------------------------")
}
}
Sample output on my machine. Your machine result will be different.
Name : lo0
Interface Address #0 : ::1/128
Interface Address #1 : 127.0.0.1/8
Interface Address #2 : fe80::1/64
------------------------------------
Name : gif0
------------------------------------
Name : stf0
------------------------------------
Name : en3
Interface Address #0 : fe80::1aa6:f7ff:fe16:e80b/64
Interface Address #1 : 192.168.1.64/24
------------------------------------
If the network interface has no IP address, usually it means the status is DOWN.
References:
See also : Golang : How to detect a server/machine network interface capabilities?
By Adam Ng
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