Port Scanner - Check Port Status (TCP & UDP Ports)
Our online port checker tool is a free resource that helps you identify what ports are open and running services on a network. With our port tester, you can also identify closed ports that are not running any service and are not accepting traffic.
This open port scanner tool is designed to provide accurate results. Using our open port check tool, users can receive multiple forms of assistance. For example:
- DevOps can confirm that a service restart actually made the port reachable.
- Networking professionals can verify whether port forwarding is enabled on the routers.
- Online businesses can utilize it for remote management access and troubleshooting.
How to Check Open Ports With Our Port Tester?
Follow the steps below to check if port is open or closed using our tool:
- Open our port checker tool.
- Enter a domain/hostname or a public IP address inside the provided field.
- Next, you will see the custom port type selected by default. To scan custom ports, enter the port numbers in the field at the bottom (separated by commas) and click the check button.
- Or you can also select the port type that you want to scan from the drop-down, among the following.
- Server ports
- Game ports
- Application ports
- P2P Ports
- Alternatively, you can also choose from the commonly used port types listed in the right column, or scan all of them with a single click on “Scan All Ports” button.
After a few seconds, you get results in table format that shows which ports are open or closed. Additionally, after getting your scan results you can download or copy it in JSON/CSV file for later use.
What Results Do You Get With Our Port Scanner?
When you check port status using our online port scanner, it provides instant results in a table format. The table has three columns that indicate the port title, port number, and its status.
Regarding the status, you will see two types of results:
- Open:Means that the port number is open and running services.
- Timed Out: This means that the port is closed and not accepting traffic.
Key Features of Our Port Checker
Our online port checker is a simple tool that gives you accurate port scan results instantly. Here are some of the features that make it stand out.
1. Instant Port Status
When you run a domain or public IP address through our open port check tool, you receive results within seconds. The process is seamless; you do not have to register or sign up.
2. Support for Multiple Port Types
Our IP port checker lets you test different categories of ports, including:
- Game: Check if your game's required ports are open for smooth online play.
- Server: Test ports commonly used by web, mail, or FTP servers to ensure proper connectivity.
- Application: Verify if ports used by desktop or mobile applications are accessible through your network.
- P2P Ports: Verify that ports used by peer-to-peer services, such as torrents, are open for file sharing.
Alternatively, you can enter a specific port number to test for accessibility.
3. Easy-to-Read Results
All results are presented in a simple table format, including port title, number, and status. Additionally, our open port scanner enables you to copy and download the results as JSON and CSV files.
4. One-Click Common Port Scans
Our IP port scanner offers the option to scan commonly used ports, including FTP, POP3, SSL, VNC, SFTP, SMB, Telnet, DNS, and many more, which saves time by instantly scanning these ports in one go.
5. Multilingual Support
Our tool is multilingual, allowing you to switch between different languages to view instructions in the one you’re most comfortable with. Other than English, we are currently available in the following languages:
Why Do You Need to Check Open Ports?
You should check open ports because every open port acts like an entry point into your system. Scanning helps you improve security by closing unnecessary open ports that an attack might exploit. The following are the key reasons why checking open ports matters.
- Network Performance: Every open port means a service or application is running in the background. Having too many ports open means too many unnecessary services are active. This means more resource consumption and slow network performance. Checking open ports allows you to shut down what’s not needed. This helps you maintain a fast and efficient network.
- Network Protection from Vulnerable Ports: All ports in a network that are open will accept any traffic without any checks. So, security experts have to scan all open ports and close the ones that are unnecessary. This helps lock down methods of attack.
- Network Troubleshooting: When something isn’t working, such as a website, email server, or remote access, conducting an open port check can help reveal the problem.
- Strengthen Security: Hackers often look for open ports to find vulnerabilities. If they discover an unnecessary port is open, they can attempt to exploit it and carry out attacks, such as a port scan attack. By scanning for ports, you can quickly spot any unwanted access points and close them before they become a risk.
List of the Most Commonly Scanned Ports
Common port numbers used almost daily by your device are:
- Port 80 – Handles HTTP traffic (regular website access)
- Port 443 – Used for HTTPS traffic (secure, encrypted websites)
- Port 25 – Manages SMTP traffic (sending emails)
- Port 53 – Supports DNS traffic (translating domain names to IP addresses)
- Ports 20 & 21 – Facilitate FTP traffic (file transfers between devices)
- Port 23 – Used for Telnet, which allows remote login to devices. However, Telnet is outdated and insecure today.
- Port 115 – Used for the SFTP (Simple File Transfer Protocol), similar to FTP but adds encryption for security.
- Port 110 – Retrieves emails from a mail server using the POP3 (Post Office Protocol v3) service.
- Port 143 – Lets you access and manage emails directly on the mail server via the IMAP (Internet Message Access Protocol) service.
- Port 135 – Helps applications communicate across different computers by MSRPC (Microsoft Remote Procedure Call) protocol.
- Port 139 & 445 – Enable file and printer sharing over local networks using the SMB (Server Message Block) protocol.
- Port 1433: Used by Microsoft SQL Server databases.
- Port 3306: Handles communication for MySQL databases.
- Port 194: Supports online chat services with the IRC (Internet Relay Chat) protocol.
- Port 3389: Allows you to remotely control another computer using the RDP (Remote Desktop Protocol) service.
- Port 5900: Another protocol for remote desktop access that is known as the VNC (Virtual Network Computing) protocol.
- Port 5632: Used for remote control software using the PCAnywhere service.
- Port 25565: Commonly associated with game servers, especially Minecraft.
There are more, but these are the main ones.
Frequently Asked Questions (FAQs)
What is port forwarding/mapping?
Port forwarding is the process of redirecting traffic from one port on your router or firewall to a specific device on your local network. The method that describes how one port is linked to another is referred to as port mapping.
What is the difference between TCP and UDP ports?
TCP and UDP are not themselves ports. They are two different networking protocols that have their own set of ports. TCP handles ports with a focus on ensuring accurate data delivery. UDP handles ports with a focus on delivering data packets quickly. Each port number can exist in both TCP and UDP, and its purpose depends on which protocol is being used.
How do I know if a port is closed or open?
To check whether a port is closed, use our port tester tool to perform a port scan. Inside the results, the ports that show “Time Out” are closed. Those that indicate the “Open” status are the open ports.
Can I use the Port Scanner to identify port configuration issues when checking port status?
Yes, our online port scanner can help you spot port misconfigurations. A port misconfiguration means whether a port is unnecessarily opened or closed. By running a port scan with our tool, you can identify any ports that are not behaving as expected.