Network Tools
Check network connectivity with our tools. Enter a host/IP address and select the tool you want to use.
Common Ports
Click on a port to quickly check it:
Port checking is done by attempting to establish a connection to the specified host and port using the selected protocol (TCP or UDP). Note: Some networks may block certain connection attempts for security reasons.
Understanding Network Ports
What is a Port?
In computer networking, a port is a communication endpoint that identifies a specific process or service on a computer. Ports are represented by numbers ranging from 0 to 65535 and work alongside IP addresses to direct network traffic to the right application.
Think of an IP address as the address of a building, while ports are like different room numbers within that building. Each room (port) serves a different purpose and hosts different activities (services).
Common Port Categories
- Well-known ports (0-1023): Reserved for common system services like HTTP (80), HTTPS (443), and SSH (22).
- Registered ports (1024-49151): Registered with IANA for specific services but can be used by regular applications.
- Dynamic/Private ports (49152-65535): Used for temporary connections and private services.
Most Common Ports and Their Uses
Web & Email
- Port 80: HTTP - Standard web browsing
- Port 443: HTTPS - Secure web browsing
- Port 25: SMTP - Sending email
- Port 110: POP3 - Receiving email
- Port 143: IMAP - Email synchronization
File Transfer & Remote Access
- Port 21: FTP - File Transfer Protocol
- Port 22: SSH - Secure Shell for remote access
- Port 23: Telnet - Unencrypted remote access
- Port 3389: RDP - Remote Desktop Protocol
- Port 5900: VNC - Virtual Network Computing
This information is provided for educational purposes. Port requirements may change over time.
For the most up-to-date information, always refer to the official documentation of the service you're using.