#!/usr/bin/env python# -*- coding: utf-8 -*-def ip2num(ip):    ip = [int(x) for x in ip.split('.')]    return ip[0] << 24 | ip[1] << 16 | ip[2] << 8 | ip[3]def num2ip(num):    return '%s.%s.%s.%s' % (        (num & 0xff000000) >> 24,        (num & 0x00ff0000) >> 16,        (num & 0x0000ff00) >> 8,        num & 0x000000ff    )def gen_ips(start, end):    """生成IP地址"""    # if num & 0xff 过滤掉 最后一段为 0 的IP    return [num2ip(num) for num in range(start, end + 1) if num & 0xff]