1.判斷ipv4 or ipv6

// return int 0:錯誤的ip 4:ipv4 6:ipv6
func CheckIp(ip string) int {if ip == "" {return 4}out := net.ParseIP(ip)if out == nil {return 0}if strings.Contains(out.String(), ".") {return 4}if strings.Contains(out.String(), ":") {return 6}return 0
}

2.計算cidr格式ip所含IP個數

func CountIPs(cidr string) (int64, error) {_, ipNet, err := net.ParseCIDR(cidr)if err != nil {return 0, err}mask := ipNet.Maskones, bits := mask.Size()numIPs := int64(1 << uint(bits-ones))//fmt.Printf("CIDR IP: %s\n", ipNet)//fmt.Printf("子網掩碼: %s\n", mask.String())//fmt.Printf("IP個數: %d\n", numIPs)return numIPs, err
}

3.計算兩個ip區間所含ip個數

func ipToInt(ip net.IP) int64 {ip = ip.To4()if ip == nil {return 0}ipParts := strings.Split(ip.String(), ".")ipInt := int64(0)for i := 0; i < 4; i++ {part, _ := strconv.ParseInt(ipParts[i], 10, 64)ipInt += part << ((3 - uint(i)) * 8)}return ipInt
}func main() {startIP := "183.62.142.241"endIP := "183.62.145.233"// ip格式校驗start := net.ParseIP(startIP)if start == nil {log.Fatal("Invalid start IP address")}end := net.ParseIP(endIP)if end == nil {log.Fatal("Invalid end IP address")}startInt := ipToInt(start)endInt := ipToInt(end)count := endInt - startInt + 1fmt.Printf("Number of IPs between %s and %s: %d\n", startIP, endIP, count)
}