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
+7.9k Golang : What is the default port number for connecting to MySQL/MariaDB database ?
+25.7k Golang : Find files by name - cross platform example
+8k Golang : Serving HTTP and Websocket from different ports in a program example
+5.5k Golang : Combine slices of complex numbers and operation example
+4.4k Golang : Generate Interleaved 2 inch by 5 inch barcode
+7.3k Golang : Ackermann function example
+17.3k Golang : Example for RSA package functions
+7.8k Golang : GMail API create and send draft with simple upload attachment example
+9.1k Golang : cannot assign type int to value (type uint8) in range error
+5.5k Android Studio : Hello World example
+40.2k Golang : Convert string to array/slice
+5.7k Golang : Check if password length meet the requirement