Golang : Convert IP address string to long ( unsigned 32-bit integer )

Here is another way of converting IPv4 string to long ( unsigned 32-bit integer ). Pretty similar to the previous tutorial on how to convert IPv4 address to base 10.

Here you go!

 package main

 import (
 "bytes"
 "encoding/binary"
 "fmt"
 "net"
 "strconv"
 )

 func ip2Long(ip string) uint32 {
 var long uint32
 binary.Read(bytes.NewBuffer(net.ParseIP(ip).To4()), binary.BigEndian, &long)
 return long
 }

 func backtoIP4(ipInt int64) string {

 // need to do two bit shifting and “0xff” masking
 b0 := strconv.FormatInt((ipInt>>24)&0xff, 10)
 b1 := strconv.FormatInt((ipInt>>16)&0xff, 10)
 b2 := strconv.FormatInt((ipInt>>8)&0xff, 10)
 b3 := strconv.FormatInt((ipInt & 0xff), 10)
 return b0 + "." + b1 + "." + b2 + "." + b3
 }

 func main() {
 result := ip2Long("98.138.253.109")
 fmt.Println(result)

 // or if you prefer the super fast way
 faster := binary.BigEndian.Uint32(net.ParseIP("98.138.253.109")[12:16])
 fmt.Println(faster)

 faster64 := int64(faster)

 fmt.Println(backtoIP4(faster64))
 }

Output:

1653276013

1653276013

98.138.253.109

References:

https://www.socketloop.com/tutorials/golang-convert-decimal-number-integer-to-ipv4-address

https://www.socketloop.com/tutorials/golang-convert-ipv4-address-to-decimal-number-base-10-or-integer