What is the net.IPv4 function in Golang?

The IPv4 function of the net package in Golang returns a 16-byte IP object that corresponds to a given set of bytes that represent an IPv4 address.

To use the IPv4 function, we first import the net package into our program, as shown below:

import (
   "net"
)

Syntax

The syntax of the IPv4 function is shown below:

func IPv4(a, b, c, d byte) IP

Parameters

The IPv4 function accepts 4 byte objects with values between 0 and 255. These parameters are then combined to form an IPv4 address of the form a.b.c.d.

Return value

The IPv4 function returns a 16-byte IP address that corresponds to the IPv4 address a.b.c.d.

Code

The code below shows how the IPv4 function works in Golang.

package main
// Import the necessary packages
import (
   "net"
   "fmt"
)
func main(){
  // Call the IPv4 function for different byte sets
  fmt.Println(net.IPv4(255, 255, 255, 0))
  fmt.Println(net.IPv4(15, 0, 16, 0))
  fmt.Println(net.IPv4(128, 128, 128, 128))
}

Explanation

  • Lines 4 to 7: We import the net and fmt packages.
  • Line 12: We call the IPv4 function on the byte set (255, 255, 255, 0). Consequently, the function returns an IP address in the form a.b.c.d, i.e., 255.255.255.0.
  • Line 13: We call the IPv4 function on the byte set (15, 0, 16, 0). The function returns the IP address 15.0.16.0.
  • Line 14: We call the IPv4 function on the byte set (128, 128, 128, 128). The function returns the IP address 128.128.128.128.

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