You enter a public IP address or domain name and the specific port number you want to test.
The tool attempts to initiate a TCP connection from its server to the entered IP/domain and port.
If the port is open and accepting connections, it responds.
The system interprets the response:
The check is performed from an external server, not your local machine—this helps simulate a real-world scenario (e.g., a user trying to connect to your service from the internet).
It uses a TCP socket connection for the test (not UDP), making it ideal for web servers, email servers, gaming servers, and more.
Ensure game servers are accessible by checking if essential ports (e.g., 25565 for Minecraft) are open for smooth multiplayer gameplay.
Audit open and closed ports to detect security risks, confirm firewall rules, and keep enterprise networks locked down and protected.
Verify if their websites or APIs are reachable through ports like 80 (HTTP) and 443 (HTTPS) from external connections during deployment.
Test port availability for remote access tools like SSH (22) or FTP (21) to ensure secure and consistent system administration.
Check if ISPs are blocking ports for hosting services like personal web servers, VoIP, or email clients from home networks.
Troubleshoot client connectivity issues by testing remote server ports in real time to pinpoint service disruptions or blocks.
A Port Checker Tool is essential for maintaining a secure, functional, and accessible network. Whether you're troubleshooting issues, configuring servers, or enhancing cybersecurity, this tool offers real-time insights that help you detect vulnerabilities and verify port availability — all without installing any software.
Explore the robust functionalities that make this port scanning tool essential for IT professionals, gamers, developers, and home users.
Instantly checks if a port is:
Verifies if port forwarding is properly configured on your router, enabling external access to services like game servers (e.g., Minecraft on port 25565), web apps, or FTP.
Helps identify unnecessary open ports that may pose security risks. Ideal for penetration testing or tightening firewall rules to prevent unauthorized access.
Manually test specific port numbers or scan common ranges like 0–1023 to detect services running on well-known ports such as SSH (22), FTP (21), or HTTPS (443).
Clean, responsive interface with:
Fully browser-based—just open the site and start scanning. No software, no sign-ups, and works on desktops, tablets, and smartphones.
Our Port Checker Tool stands out as a fast, reliable, and secure way to test port connectivity from an external network. Designed for both professionals and casual users, it helps troubleshoot issues, verify configurations, and improve network security—all through a clean, intuitive, web-based interface.
Unlike many tools that test from your own device, our tool initiates port checks from an external server. This simulates how the rest of the internet sees your network, making it perfect for testing port forwarding, remote accessibility, and firewall rules. Whether you’re hosting a website, configuring a home server, or enabling access to a gaming platform, you’ll receive accurate insights into whether your ports are visible, open, or blocked. This eliminates false positives and ensures your real-world connectivity is as expected.
From HTTP (port 80) to HTTPS (443), FTP (21), SSH (22), RDP (3389), and game-specific ports like 25565 for Minecraft, our tool allows you to test a full range of TCP ports with ease. You can also manually enter any custom port number, making it suitable for enterprise apps, VoIP systems, and developer staging servers. This flexibility makes it a go-to tool for developers, gamers, IT admins, and system integrators alike.
No setup. No downloads. No registration. Our web-based tool delivers real-time feedback on port availability in just one click. The lightweight interface is optimized for speed, allowing users to test ports instantly without technical delays. Whether you’re on a desktop or mobile, the tool adjusts responsively and delivers a seamless experience, saving time during urgent troubleshooting or server deployment.
Open ports can expose your device or server to unauthorized access and malicious attacks. With our tool, users can perform basic port security audits by identifying unnecessary open ports that should be closed. It’s a valuable first step in hardening firewalls, tightening router configurations, and minimizing your attack surface—especially for public-facing services.
Whether you're setting up a new service, facing a connection timeout, or debugging firewall behavior, our port checker provides clarity. It helps detect whether a blocked port is causing the failure and whether the server is reachable externally. This can drastically reduce diagnostic time for IT support teams, network engineers, and even home users trying to configure their router.
We respect user privacy and security. Our port testing tool does not collect personal data, and all checks are conducted using encrypted sessions (HTTPS). No logs are stored, and no unnecessary permissions are asked. It’s an anonymous, safe testing environment for users who want a reliable solution without compromising their digital footprint.
A Port Checker Tool is an online utility used to test whether a specific port on your network or device is open, closed, or blocked. It helps determine if services like web servers, FTP, email, or game servers are accessible from the internet.
The tool sends a TCP request from an external server to the selected port on your IP address or domain. It then checks the response to determine whether the port is open (accepting connections), closed (not listening), or filtered (blocked by a firewall or ISP).
Checking port status helps troubleshoot connectivity issues, verify firewall or port forwarding configurations, and secure your network by identifying unintended open ports. It’s especially useful for hosting websites, running remote services, or gaming servers.
Yes, you can test both common ports like 80 (HTTP), 443 (HTTPS), 21 (FTP), or 25565 (Minecraft), and custom port numbers within the valid range (0–65535), depending on your use case or application.
Yes. The tool is secure, web-based, and does not install anything on your system. It uses encrypted HTTPS connections and does not log your IP address or store any test data, ensuring a safe and anonymous experience.
The standard online version tests TCP ports, which cover most internet services. UDP testing requires a more advanced setup, which may not be supported on all online tools due to its stateless nature.
A filtered or timed-out result usually indicates that a firewall, NAT rule, or ISP is blocking that port. No response was received by the testing server, meaning the port may be hidden for security or misconfigured.
No installation is required. The tool is fully browser-based. Just visit the site, enter your IP and port number, and receive instant results—no downloads, plug-ins, or technical setup needed.
Most tools only support TCP ports, not UDP, which limits testing for services like DNS or video streaming protocols.
They can only test ports on publicly accessible IPs—private or internal network devices can't be scanned directly.
Firewalls or ISPs may block test probes, leading to false negatives even when ports are correctly forwarded.
Online tools provide one-time checks only—they don’t offer ongoing port status monitoring or alerting features.
Understanding commonly used ports helps configure, troubleshoot, and secure your network. These ports are standard gateways for internet and intranet communication used by web services, applications, and servers.
Used to transfer files between systems over a TCP/IP network. It allows uploading, downloading, and managing files on a remote server.
Provides secure remote login and encrypted communication between devices, often used by system administrators for command-line access.
An older protocol for remote command-line access. SSH mostly replaces it due to its lack of encryption and inherent security risks.
Used for sending email messages between mail servers. It’s the standard protocol for outbound email communication over the internet.
Translates domain names into IP addresses. This port allows devices to locate and communicate with websites and services by name.
The default port for unencrypted web traffic. Web browsers use it to load websites and access online resources.
Retrieves emails from a mail server to a local client and typically removes the messages from the server after download.
Allows email clients to access messages on the mail server without downloading them, keeping emails synced across devices.
Handles encrypted web traffic using SSL/TLS. It ensures secure communication between browsers and servers, protecting user data online.
Instantly Check If Your Ports Are Open, Closed, or Blocked — No Installation Needed! Use our free, secure Port Checker Tool to diagnose connectivity issues, verify firewall rules, and ensure your services are reachable.
Start scanning now and take control of your network visibility!