判断某个ip是否属于某个网段

package main

import (
    "fmt"
    "strconv"
    "strings"
)

func main() {
    fmt.Println(isBelong(`10.187.102.8`, `10.187.102.0/24`))

}

func isBelong(ip, cidr string) bool {
    ipAddr := strings.Split(ip, `.`)
    if len(ipAddr) < 4 {
        return false
    }
    cidrArr := strings.Split(cidr, `/`)
    if len(cidrArr) < 2 {
        return false
    }
    var tmp = make([]string, 0)
    for key, value := range strings.Split(`255.255.255.0`, `.`) {
        iint, _ := strconv.Atoi(value)

        iint2, _ := strconv.Atoi(ipAddr[key])

        tmp = append(tmp, strconv.Itoa(iint&iint2))
    }
    return strings.Join(tmp, `.`) == cidrArr[0]
}