Port Scanner Tool
Check open ports, scan network services, and verify security
Port Scanner
Common Ports Reference
| Port | Service | Description |
|---|---|---|
| 20 | FTP-DATA | File Transfer Protocol - Data |
| 21 | FTP | File Transfer Protocol - Control |
| 22 | SSH | Secure Shell - Secure remote access |
| 23 | TELNET | Telnet - Remote terminal access |
| 25 | SMTP | Simple Mail Transfer Protocol - Email sending |
| 53 | DNS | Domain Name System - Name resolution |
| 80 | HTTP | Hypertext Transfer Protocol - Web browsing |
| 110 | POP3 | Post Office Protocol v3 - Email retrieval |
| 143 | IMAP | Internet Message Access Protocol - Email access |
| 443 | HTTPS | HTTP Secure - Encrypted web browsing |
| 993 | IMAPS | IMAP over SSL - Secure email access |
| 995 | POP3S | POP3 over SSL - Secure email retrieval |
| 1433 | MSSQL | Microsoft SQL Server - Database |
| 3306 | MySQL | MySQL Database - Database server |
| 3389 | RDP | Remote Desktop Protocol - Remote desktop |
| 5432 | PostgreSQL | PostgreSQL Database - Database server |
| 5900 | VNC | Virtual Network Computing - Remote desktop |
| 8080 | HTTP-ALT | HTTP Alternate - Alternative web server |
| 8443 | HTTPS-ALT | HTTPS Alternate - Alternative secure web server |
Frequently Asked Questions
What is a port scanner?
A port scanner is a tool that checks which ports are open or closed on a network device. It helps identify running services and potential security vulnerabilities by testing network connectivity to specific ports.
What are common ports to scan?
Common ports include 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 25 (SMTP), 53 (DNS), 3306 (MySQL), and 5432 (PostgreSQL). These ports typically host essential network services.
Is port scanning legal?
Port scanning is generally legal when performed on your own networks or with explicit permission. Always ensure you have authorization before scanning any network to avoid legal issues.
What does an open port mean?
An open port indicates that a service is listening for connections on that port. This could be a web server, database, email server, or other network service that's actively running.
How can I secure my network?
To secure your network: close unnecessary ports, use firewalls, keep services updated, use strong passwords, enable encryption, and regularly scan for vulnerabilities. Only open ports that are essential for your services.
What are the different port ranges?
Ports 1-1024 are well-known ports (assigned to common services), 1025-49151 are registered ports (assigned by IANA), and 49152-65535 are dynamic/private ports (available for temporary use).