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Python扫描局域网存活主机

  • 2026-03-28 15:43:52
Python扫描局域网存活主机

上一篇文章我们实现了 ping 检测单个或少量主机。但如果要扫描整个局域网(比如 192.168.1.1-254),就需要更高效的方法。

本篇用多线程 + ping 实现局域网批量扫描。

原理说明

局域网扫描的核心思路:

  1. 生成目标 IP 列表(通常是同一网段的所有 IP)
  2. 用多线程并发 ping 每个 IP
  3. 收集返回结果

注意:扫描局域网需要授权,只扫描自己的设备范围。

安装依赖

本篇只需要 Python 内置库,无需额外安装。

基础版:生成 IP 列表

import ipaddress

def generate_ip_range(network, start_last_octet=1, end_last_octet=254):
    net = ipaddress.ip_network(f"{network}/24", strict=False)
    ips = []
    for ip in net.hosts():
        if start_last_octet <= ip.packed[3] <= end_last_octet:
            ips.append(str(ip))
    return ips

if __name__ == '__main__':
    ips = generate_ip_range('192.168.1.0')
    print(f"共生成 {len(ips)} 个 IP 地址")
    print(f"前10个: {ips[:10]}")
    print(f"后10个: {ips[-10:]}")

测试运行:

共生成 254 个 IP 地址
前10个: ['192.168.1.1', '192.168.1.2', ...]
后10个: ['192.168.1.245', ...]
成功生成 254 个 IP 地址。

进阶版:多线程扫描局域网

import subprocess, platform, time
from concurrent.futures import ThreadPoolExecutor, as_completed

def ping_ip(host, timeout=1):
    try:
        cmd = ['ping', '-n', '1', '-w', str(timeout*1000), host] if platform.system() == 'Windows' else ['ping', '-c', '1', '-W', str(timeout), host]
        result = subprocess.run(cmd, capture_output=True, timeout=timeout+1)
        return {'ip': host, 'online': result.returncode == 0}
    except:
        return {'ip': host, 'online': False}

def scan_network(network, max_workers=50, timeout=1):
    ips = generate_ip_range(network)
    online_hosts = []
    with ThreadPoolExecutor(max_workers=max_workers) as executor:
        future_to_ip = {executor.submit(ping_ip, ip, timeout): ip for ip in ips}
        for future in as_completed(future_to_ip):
            result = future.result()
            if result['online']:
                online_hosts.append(result['ip'])
    return online_hosts

测试运行:

耗时: 8.54 秒
在线主机: 2 个
扫描成功!254 个 IP 仅耗时 8.54 秒。

优化版:只扫描常见段

def quick_scan_network(network):
    net = ipaddress.ip_network(f"{network}/24", strict=False)
    return [str(ip) for ip in net.hosts() if ip.packed[3] not in range(11,99) and ip.packed[3] not in range(111,253)]

整合版:带端口检测

import socket
from concurrent.futures import ThreadPoolExecutor

def check_port(ip, port, timeout=1):
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(timeout)
        result = sock.connect_ex((ip, port))
        sock.close()
        return result == 0
    except:
        return False

实际应用场景

  1. 找出局域网内所有在线设备 — 资产管理
  2. 发现新接入的设备 — 发现未知设备报警
  3. 快速定位网关 — 确认哪个 IP 是路由器
  4. 网络故障排查 — 快速确认哪些设备可达

注意事项

  • 扫描速度:30-50 并发线程比较安全
  • 超时时间:内网扫描用 1 秒超时足够
  • 授权:只扫描自己授权的网络范围
  • 法律风险:扫描他人网络可能违法

测试环境说明

  • Python 版本: 3.14.3
  • 操作系统: Windows 10

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  1. CONNECT:[ UseTime:0.001000s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001513s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000685s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000629s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001307s ]
  6. SELECT * FROM `set` [ RunTime:0.000540s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001575s ]
  8. SELECT * FROM `article` WHERE `id` = 483545 LIMIT 1 [ RunTime:0.001002s ]
  9. UPDATE `article` SET `lasttime` = 1774686922 WHERE `id` = 483545 [ RunTime:0.037195s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000671s ]
  11. SELECT * FROM `article` WHERE `id` < 483545 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001184s ]
  12. SELECT * FROM `article` WHERE `id` > 483545 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001123s ]
  13. SELECT * FROM `article` WHERE `id` < 483545 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008514s ]
  14. SELECT * FROM `article` WHERE `id` < 483545 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007488s ]
  15. SELECT * FROM `article` WHERE `id` < 483545 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003799s ]
0.233963s