Golang : Convert IPv4 address to decimal number(base 10) or integer
Problem :
IP address in decimal is easier to search, filter or compare. For example, searching for IP address in a given range.
You want to convert IPv4 address to integer to perform bitwise operation or for efficient storage in a database. How to do that?
Solutions :
package main
import (
"fmt"
"net"
"strconv"
"strings"
)
func IP4toInt(IPv4Addr net.IP) int64 {
bits := strings.Split(IPv4Addr.String(), ".")
b0, _ := strconv.Atoi(bits[0])
b1, _ := strconv.Atoi(bits[1])
b2, _ := strconv.Atoi(bits[2])
b3, _ := strconv.Atoi(bits[3])
var sum int64
// left shifting 24,16,8,0 and bitwise OR
sum += int64(b0) << 24
sum += int64(b1) << 16
sum += int64(b2) << 8
sum += int64(b3)
return sum
}
func main() {
ipDecimal := IP4toInt(net.ParseIP("98.138.253.109"))
fmt.Println(ipDecimal)
}
Output :
1653276013
Is there an easier way? Of course! See this next example :
package main
import (
"fmt"
"math/big"
"net"
)
func IP4toInt(IPv4Address net.IP) int64 {
IPv4Int := big.NewInt(0)
IPv4Int.SetBytes(IPv4Address.To4())
return IPv4Int.Int64()
}
func main() {
ipv4Decimal := IP4toInt(net.ParseIP("98.138.253.109"))
fmt.Println(ipv4Decimal)
}
Output :
1653276013
Happy coding!
References :
https://www.socketloop.com/tutorials/golang-how-to-convert-cast-string-to-ip-address
See also : Golang : Convert decimal number(integer) to IPv4 address
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+18k Golang : How to make a file read only and set it to writable again?
+8.4k Golang : Configure Apache and NGINX to access your Go service example
+8.1k Golang : Sort words with first uppercase letter
+10.7k Golang : Flip coin example
+7.5k Linux : How to fix Brother HL-1110 printing blank page problem
+6.1k Golang : Experimenting with the Rejang script
+5k Python : Find out the variable type and determine the type with simple test
+9.5k Facebook : Getting the friends list with PHP return JSON format
+33.8k Golang : All update packages with go get command
+8.3k Golang : Metaprogramming example of wrapping a function
+6.9k Golang : Pat multiplexer routing example
+22.9k Golang : untar or extract tar ball archive example