Primary port for unencrypted web browsing. Web servers typically use this port for standard HTTP connections. Visiting sites without encryption uses this port.
443 - HTTPS (HTTP Secure)
Encrypted web communication using TLS/SSL protocols. Required for secure e-commerce, login pages, and any site handling sensitive information.
22 - SSH (Secure Shell)
Encrypted protocol for secure remote server access. Enables administrators to log in and execute commands on remote systems safely.
21 - FTP (File Transfer Protocol)
Legacy protocol for file transfers between systems. Lacks encryption, making it vulnerable. Prefer SFTP (port 22) or FTPS (port 990) for secure transfers.
25 - SMTP (Simple Mail Transfer Protocol)
Standard port for email transmission between mail servers. Frequently blocked by ISPs to reduce spam. Contemporary email systems prefer ports 587 or 465.
53 - DNS (Domain Name System)
Converts human-readable domain names to numeric IP addresses. Fundamental internet service. Typically uses UDP for standard queries, TCP for extended data transfers.
110 - POP3 (Post Office Protocol v3)
Email retrieval protocol that downloads messages to your device and deletes them from the server. For encrypted access, use POP3S on port 995.
143 - IMAP (Internet Message Access Protocol)
Email protocol that maintains messages on the server, enabling access from multiple devices. For encrypted connections, use IMAPS on port 993.
993 - IMAPS (IMAP over SSL/TLS)
Encrypted IMAP implementation with SSL/TLS protection. The preferred method for accessing IMAP email in current email applications.
995 - POP3S (POP3 over SSL/TLS)
POP3 with SSL/TLS encryption for secure email retrieval. The recommended approach for POP3 connections in today's email software.
3389 - RDP (Remote Desktop Protocol)
Microsoft's protocol enabling remote desktop control of Windows machines. Requires robust password protection and ideally VPN access for security.
3306 - MySQL
Standard MySQL database connection port. Requires strict security measures and should never be publicly accessible without firewall protection.
5432 - PostgreSQL
Default PostgreSQL database connection port. Must be properly secured and restricted to prevent unauthorized database access.
6379 - Redis
Redis in-memory database default port. Popular for caching and session management. Requires authentication and should remain private, not publicly exposed.
27017 - MongoDB
MongoDB NoSQL database default connection port. Widely adopted in contemporary web development. Needs authentication and strict network access restrictions.