[Golang] 檢查IP 是否在特定範圍內的簡單範例

檢查IP 是否在特定範圍內，的最快方法是什麼？例如，給定範圍192.168.1.1至192.168.10.254，如何檢查給定的輸入IP是否在該範圍內？以下是簡單範例:

package main

import (

    "bytes"

    "fmt"

    "net"

)

var (

    ip1 = net.ParseIP("192.168.1.1")

    ip2 = net.ParseIP("192.168.10.254")

)

func check(ip string) bool {

    trial := net.ParseIP(ip)

    if trial.To4() == nil {

        fmt.Printf("%v is not an IPv4 address\n", trial)

        return false

    }

    if bytes.Compare(trial, ip1) >= 0 && bytes.Compare(trial, ip2) <= 0 {

        fmt.Printf("%v is between %v and %v\n", trial, ip1, ip2)

        return true

    }

    fmt.Printf("%v is NOT between %v and %v\n", trial, ip1, ip2)

    return false

}

func main() {

    check("1.2.3.4")

    check("216.14.49.185")

    check("192.168.3.3")

    check("1::16")

}

Result:

1.2.3.4 is NOT between 192.168.1.1 and 192.168.10.254 216.14.49.185 is NOT between 192.168.1.1 and 192.168.10.254 192.168.3.3 is between 192.168.1.1 and 192.168.10.254 1::16 is not an IPv4 address

https://stackoverflow.com/questions/19882961/go-golang-check-ip-address-in-range