🚪 Open Port Checker
Check if specific ports are open or closed on any IP address or hostname. Scan common service ports for accessibility.
什么是端口扫描？
端口扫描是一种用于识别主机上开放网络端口的技术。每个端口号对应一个特定的服务或协议。通过检查哪些端口是开放的，您可以确定服务器上运行的服务并识别潜在的安全漏洞。
常用端口
| 端口 | 服务 |
|---|---|
| 21 | FTP |
| 22 | SSH |
| 23 | Telnet |
| 25 | SMTP |
| 53 | DNS |
| 80 | HTTP |
| 110 | POP3 |
| 143 | IMAP |
| 443 | HTTPS |
| 465 | SMTPS |
| 587 | Submission |
| 993 | IMAPS |
| 995 | POP3S |
| 3306 | MySQL |
| 3389 | RDP |
| 5432 | PostgreSQL |
| 8080 | HTTP Alt |
| 8443 | HTTPS Alt |