func ParseIP(s string) IP

https://golang.org/pkg/net/#ParseIP

The ParseIP function

• Returns nil if the given IP address is not valid
• Else it creates an instance of IP struct and returns that.

Let’s see a working code:

package main

import (
    "fmt"
    "net"
)

func main() {
    validIPV4 := "10.40.210.253"
    
    checkIPAddress(validIPV4)

    invalidIPV4 := "1000.40.210.253"
    checkIPAddress(invalidIPV4)

    valiIPV6 := "2001:0db8:85a3:0000:0000:8a2e:0370:7334"
    checkIPAddress(valiIPV6)

    invalidIPV6 := "2001:0db8:85a3:0000:0000:8a2e:0370:7334:3445"
    checkIPAddress(invalidIPV6)
}

func checkIPAddress(ip string) {
    if net.ParseIP(ip) == nil {
        fmt.Printf("IP Address: %s - Invalid\n", ip)
    } else {
        fmt.Printf("IP Address: %s - Valid\n", ip)
    }
}

Output:

IP Address: 10.40.210.253 - Valid
IP Address: 1000.40.210.253 - Invalid
IP Address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334 - Valid
IP Address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334:3445 - Invalid

The post Validate an IP address in GO appeared first on Welcome To Golang By Example.