Port Number Checker

The Port Number Checker is a free online tool that helps you search, filter, and explore common TCP and UDP port numbers. Instantly find port details, protocols, security levels, and alternative ports. Perfect for network engineers, developers, and IT professionals.

80TCP
HTTP
Hypertext Transfer Protocol - Standard web traffic
Web ServicesLow Security
Web servers, websites, web applications
Alternatives: 443, 8080, 8000
443TCP
HTTPS
HTTP Secure - Encrypted web traffic
Web ServicesHigh Security
Secure websites, SSL/TLS encrypted connections
Alternatives: 80, 8443
21TCP
FTP
File Transfer Protocol - File sharing
File TransferLow Security
File uploads/downloads, web hosting
Alternatives: 22, 990, 989
22TCP
SSH
Secure Shell - Remote server access
Remote AccessHigh Security
Server administration, secure file transfer
Alternatives: 23, 2222
25TCP
SMTP
Simple Mail Transfer Protocol - Email sending
Email ServicesMedium Security
Email servers, mail relay
Alternatives: 587, 465
53TCP/UDP
DNS
Domain Name System - Domain resolution
Network ServicesMedium Security
Domain name resolution, DNS queries
Alternatives: 853, 5353
110TCP
POP3
Post Office Protocol v3 - Email retrieval
Email ServicesLow Security
Email clients, mail downloading
Alternatives: 995, 143
143TCP
IMAP
Internet Message Access Protocol - Email access
Email ServicesLow Security
Email synchronization, webmail
Alternatives: 993, 110
993TCP
IMAPS
IMAP over SSL/TLS - Secure email access
Email ServicesHigh Security
Secure email clients, encrypted mail
Alternatives: 143, 995
3306TCP
MySQL
MySQL Database - Database connections
DatabaseMedium Security
Web applications, database management
Alternatives: 3307, 33060
5432TCP
PostgreSQL
PostgreSQL Database - Advanced database system
DatabaseMedium Security
Enterprise applications, data analytics
Alternatives: 5433, 5434
3389TCP
RDP
Remote Desktop Protocol - Windows remote access
Remote AccessMedium Security
Windows remote desktop, server administration
Alternatives: 3390, 33890

Frequently Asked Questions

What is a port number?

A port number is a numerical identifier in networking used to specify a particular process or service on a device.

What’s the difference between TCP and UDP ports?

TCP (Transmission Control Protocol) is connection-oriented, while UDP (User Datagram Protocol) is connectionless and faster but less reliable.

How do I find which service uses a specific port?

Use the search bar above to enter a port number or service name and get instant results.

Are all ports safe to use?

No, some ports are more secure than others. Always follow best practices and consult security guidelines.

Can I export the port list?

Yes! Use the export buttons to download the filtered list as CSV or JSON.

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