Common Port Lookup
1. Query Service Port
Load Sample
2. Port Lookup Output
How to Use the Port Number Lookup
- Enter a port number (1-65535) or a service name (e.g., HTTP).
- Click the Search button.
- Review the service name, transport protocol (TCP/UDP), and description.
Formulas and Technical Logic
Network ports are standardized by the Internet Assigned Numbers Authority (IANA). The tool searches a built-in dictionary mapping integer values (1-65535) to assigned protocols and services. It cross-references both TCP and UDP assignments.
Key Features
- Search by port number or service name.
- Identifies TCP and UDP protocols.
- Highlights official IANA designations.
- Identifies known vulnerabilities.
Reference Table: Common Ports
| Port | Protocol | Service |
|---|---|---|
| 21 | TCP | FTP |
| 22 | TCP | SSH |
| 80 | TCP | HTTP |
| 443 | TCP | HTTPS |
Frequently Asked Questions
What is the difference between TCP and UDP?
TCP is connection-oriented and ensures data delivery. UDP is connectionless and prioritizes speed over reliability.
What are well-known ports?
Ports 0 through 1023 are well-known ports reserved for system services like HTTP, FTP, and SSH.