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
+18.5k Golang : Reset or rewind io.Reader or io.Writer
+7.7k Golang : Find network service name from given port and protocol
+4.7k Golang : Markov chains to predict probability of next state example
+6.7k Golang : Test if an input is an Armstrong number example
+15.1k Golang : Check if a string contains multiple sub-strings in []string?
+5k Golang : Compound interest over time example
+18.7k Golang : Accept input from user with fmt.Scanf skipped white spaces and how to fix it
+11.3k Golang : Sort and reverse sort a slice of bytes
+13.3k Golang : How to filter a map's elements for faster lookup
+32.3k Golang : All update packages with go get command
+16.4k Golang : How to log each HTTP request to your web server?
+18.2k Golang : Compare floating-point numbers