Network Port Reference
Searchable database of common network ports
Well-Known (0-1023)
Registered (1024-49151)
Dynamic/Private (49152-65535)
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Frequently Asked Questions
What is a port number?
A port number identifies a specific process or service on a networked device. Ports range from 0-65535. Well-known ports (0-1023) are assigned to common services.
What are the most common ports?
80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 25 (SMTP), 53 (DNS), 110 (POP3), 143 (IMAP), 3306 (MySQL), 5432 (PostgreSQL).
What is the difference between TCP and UDP?
TCP is connection-oriented and reliable (web, email). UDP is connectionless and faster (streaming, gaming, DNS). TCP guarantees delivery; UDP prioritizes speed.
What is the difference between well-known and registered ports?
Well-known ports (0-1023) are assigned by IANA to common services like HTTP (80) and SSH (22). Registered ports (1024-49151) are assigned to specific applications. Dynamic ports (49152-65535) are temporary.
Can I run a service on a non-standard port number?
Yes. You can run any service on any port (e.g., SSH on port 2222 instead of 22). Non-standard ports can reduce automated attacks but should not be your only security measure.
About Network Ports
Network ports are virtual endpoints for communication in computer networking. They allow multiple network services to run on a single IP address by providing unique identifiers for each service.
Port numbers range from 0 to 65535 and are divided into three ranges:
- Well-Known Ports (0-1023): Reserved for common services like HTTP, HTTPS, FTP, SSH. Require root/admin privileges to bind.
- Registered Ports (1024-49151): Can be registered by software vendors for specific applications.
- Dynamic/Private Ports (49152-65535): Used for temporary connections and private applications.
Port Guides
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