快速选择常用端口
高级选项 (批量检查)
输入多个端口,用逗号分隔(最多10个端口)

网络工具目录

按类别浏览工具或即时搜索

所有工具

常用端口参考

熟悉常用网络端口,以有效管理你的网络基础设施、解决连接问题并维护安全。这些端口作为Web服务、应用程序和服务器系统的标准通信通道。

姓名 描述
80 - HTTP (Hypertext Transfer Protocol) Primary port for unencrypted web browsing. Web servers typically use this port for standard HTTP connections. Visiting sites without encryption uses this port.
443 - HTTPS (HTTP Secure) Encrypted web communication using TLS/SSL protocols. Required for secure e-commerce, login pages, and any site handling sensitive information.
22 - SSH (Secure Shell) Encrypted protocol for secure remote server access. Enables administrators to log in and execute commands on remote systems safely.
21 - FTP (File Transfer Protocol) Legacy protocol for file transfers between systems. Lacks encryption, making it vulnerable. Prefer SFTP (port 22) or FTPS (port 990) for secure transfers.
25 - SMTP (Simple Mail Transfer Protocol) Standard port for email transmission between mail servers. Frequently blocked by ISPs to reduce spam. Contemporary email systems prefer ports 587 or 465.
53 - DNS (Domain Name System) Converts human-readable domain names to numeric IP addresses. Fundamental internet service. Typically uses UDP for standard queries, TCP for extended data transfers.
110 - POP3 (Post Office Protocol v3) Email retrieval protocol that downloads messages to your device and deletes them from the server. For encrypted access, use POP3S on port 995.
143 - IMAP (Internet Message Access Protocol) Email protocol that maintains messages on the server, enabling access from multiple devices. For encrypted connections, use IMAPS on port 993.
993 - IMAPS (IMAP over SSL/TLS) Encrypted IMAP implementation with SSL/TLS protection. The preferred method for accessing IMAP email in current email applications.
995 - POP3S (POP3 over SSL/TLS) POP3 with SSL/TLS encryption for secure email retrieval. The recommended approach for POP3 connections in today's email software.
3389 - RDP (Remote Desktop Protocol) Microsoft's protocol enabling remote desktop control of Windows machines. Requires robust password protection and ideally VPN access for security.
3306 - MySQL Standard MySQL database connection port. Requires strict security measures and should never be publicly accessible without firewall protection.
5432 - PostgreSQL Default PostgreSQL database connection port. Must be properly secured and restricted to prevent unauthorized database access.
6379 - Redis Redis in-memory database default port. Popular for caching and session management. Requires authentication and should remain private, not publicly exposed.
27017 - MongoDB MongoDB NoSQL database default connection port. Widely adopted in contemporary web development. Needs authentication and strict network access restrictions.

端口检查工具的工作原理

了解端口检查的工作原理有助于你诊断网络连接问题、验证防火墙配置并确保服务可访问。我们的工具提供了一种简单、快速的方式来测试外部网络的端口可访问性。

1

用户输入IP/域名和端口号

你输入公网IP地址或域名以及要测试的特定端口号。常见端口如21(FTP)、22(SSH)、80(HTTP)和443(HTTPS)可快速选择。

2

工具发送连接请求

该工具尝试从其服务器向输入的IP/域名和端口发起TCP连接。此请求模拟从互联网尝试访问该端口的外部连接。

3

显示结果

该工具分析响应并显示端口是开放、关闭还是被过滤。开放端口接受连接,关闭端口拒绝连接,被过滤端口被防火墙阻止。

谁使用端口检查工具?

端口检查工具为从IT专业人员到家庭网络爱好者的广泛用户提供服务。无论你是在管理企业基础设施、部署Web应用程序还是排除连接问题,端口检查都有助于验证网络可访问性、识别被阻止的端口并维护安全的网络配置。

为什么应该使用端口检查工具

端口检查工具对于维护网络安全、排除连接问题和确保正确的服务配置至关重要。无论你是管理企业基础设施的专业人员还是设置个人服务的家庭用户,了解端口状态都有助于防止安全漏洞并高效解决连接问题。

我们端口检查工具的功能

我们的端口检查工具为你的所有端口检查需求提供全面、用户友好的解决方案。以性能和可靠性为设计理念,它提供先进功能,使网络诊断快速、准确且人人可用。

常见问题

查找关于端口检查、网络诊断以及如何有效使用我们端口检查工具的常见问题答案。