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新手第一个网安脚本:用Python打造子域名收集器,再也不怕信息收集不全

  • 2026-06-30 22:11:34
新手第一个网安脚本:用Python打造子域名收集器,再也不怕信息收集不全

正文

你是不是也遇到过这种情况:

做信息收集时,手动一个一个猜子域名,比如admin.xxx.comapi.xxx.com……猜了半天,大部分打不开,效率低到想砸键盘。

其实,这种重复劳动完全可以用代码自动化

今天我就带你写一个极简但实用的子域名收集工具
全程只需要30行Python代码,学完你就能:

  • 自动枚举出目标域名下的所有子域名

  • 过滤出哪些子域名是存活的

  • 为后续的漏洞挖掘打下基础

别怕,代码我会逐行解释,新手也能跟上


一、原理:子域名收集到底在干什么?

简单说:

  • 准备一个常见子域名字典(如wwwmailadminapitest……)

  • 对每个字典项,拼接成完整域名,比如admin.example.com

  • 尝试解析这个域名的IP地址,如果能解析出来,说明这个子域名存在

你可能会问:为什么不直接用ping?
因为有些服务器禁ping,但DNS解析更可靠。


二、环境准备(30秒搞定)

  • Python 3.6+ 即可

  • 不需要安装任何第三方库,全部用标准库socketthreading(可选)


三、直接上代码(复制就能跑)

创建一个文件 subdomain_scanner.py,输入以下代码:

python

import socket# 你也可以自己扩充这个字典common_subdomains =["www","mail","ftp","localhost","webmail","smtp","pop","ns1","webdisk","ns2","cpanel","whm","autodiscover","autoconfig","admin","test","dev","api","blog","shop","forum","support","status","cdn","static","img"]defresolve(subdomain, target):"""尝试解析子域名,成功返回True,失败返回False"""    full_domain =f"{subdomain}.{target}"try:        ip = socket.gethostbyname(full_domain)print(f"[+] 发现存活子域名: {full_domain} -> {ip}")returnTrueexcept socket.gaierror:# 解析失败,子域名不存在returnFalsedefscan(target):print(f"\n开始扫描目标: {target}\n")    found =[]for sub in common_subdomains:if resolve(sub, target):            found.append(sub)print(f"\n扫描完成,共发现 {len(found)} 个存活子域名")return foundif __name__ =="__main__":    target =input("请输入目标域名(如 example.com): ").strip()    scan(target)

使用方法:

  1. 运行脚本:python subdomain_scanner.py

  2. 输入你要查的域名,比如 baidu.com

  3. 等待几秒,就会输出所有能解析出来的子域名


四、逐行解释(新手友好)

  • socket.gethostbyname(域名):这是核心,它向DNS服务器询问这个域名的IP。如果能拿到IP,说明域名存在。

  • try...except:如果解析失败,会抛出gaierror异常,我们就认为子域名不存在。

  • 字典里我预设了20多个常见子域名前缀,你可以随时增加,比如加上"oa""erp""vpn"等。

你可以拿自己的博客或者baidu.com试试,绝对不会违法,因为这是公开的DNS解析。


五、升级一下:加入多线程(装逼必备)

上面的代码是一个一个查,如果字典很大(几千条),会有点慢。
加上多线程,速度直接起飞:

python

import socketimport threadingcommon_subdomains =["www","mail","admin","api","test","dev","blog"]# 可以继续加defscan_subdomain(sub, target):    full =f"{sub}.{target}"try:        ip = socket.gethostbyname(full)print(f"[+] 发现: {full} -> {ip}")except:passdefmain():    target =input("目标域名: ")    threads =[]for sub in common_subdomains:        t = threading.Thread(target=scan_subdomain, args=(sub, target))        t.start()        threads.append(t)for t in threads:        t.join()print("扫描结束")if __name__ =="__main__":    main()

多线程代码稍微进阶一点,但抄下来就能用,你可以感受一下“秒出结果”的快感。


六、你现在已经学会了一个真实的信息收集技能

别小看这个脚本:

  • 很多渗透测试的第一步就是子域名收集

  • 你可以用它来发现自己的网站有哪些暴露在外的子域名,及时收敛风险

  • 你也可以在授权测试中,用它快速找到攻击面

这就是“白帽黑客”的正规工作内容之一:用技术发现问题,帮助修复,而不是搞破坏。


七、接下来学什么?

有了子域名,下一步可以:

  1. 对每个子域名扫描开放端口(用我们之前文章里的端口扫描器)

  2. 对开放Web服务的子域名,检测常见漏洞(SQL注入、XSS等)

这些我后续都会手把手教。


八、免费送你一份《网安新手武器库》

为了让你学得更快,我整理了:

  • ✅ 50个常用子域名字典(比文章里的丰富10倍)

  • ✅ 《Python安全编程速查表》

  • ✅ 5个合法练手的靶场网址(随便测,不犯法)

领取方式:
关注本公众号,后台回复关键词:「学习」

唯一要求:
所有技术只用于你自有系统或获得授权的目标,守住底线,才能走得远。


点个“在看”,把这篇文章分享给想学真本事的朋友。
下期预告:《用Python写一个目录爆破工具,找出隐藏的后台》

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  1. CONNECT:[ UseTime:0.000386s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000575s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001237s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.054919s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000637s ]
  6. SELECT * FROM `set` [ RunTime:0.000239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000658s ]
  8. SELECT * FROM `article` WHERE `id` = 487037 LIMIT 1 [ RunTime:0.005743s ]
  9. UPDATE `article` SET `lasttime` = 1783053304 WHERE `id` = 487037 [ RunTime:0.031817s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006673s ]
  11. SELECT * FROM `article` WHERE `id` < 487037 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016691s ]
  12. SELECT * FROM `article` WHERE `id` > 487037 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003544s ]
  13. SELECT * FROM `article` WHERE `id` < 487037 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.025806s ]
  14. SELECT * FROM `article` WHERE `id` < 487037 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022526s ]
  15. SELECT * FROM `article` WHERE `id` < 487037 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009670s ]
0.260837s