Common Port Reference
Instant search database for TCP/UDP well-known and registered network ports with security advisories and terminal CLI commands.
Port Database Status
Showing 48 of 48 indexed network ports.
FTP Data
File Transfer Protocol (Data Channel)
TCP/UDP Network Port Database & Terminal Inspector
Network ports are numerical endpoints (ranging from 0 to 65535) used by transport layer protocols like TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) to direct traffic to specific software applications or services running on a host machine.
Ports are divided into three standard ranges. Well-Known Ports (0–1023) are assigned by IANA for core infrastructure services like HTTP (80), HTTPS (443), SSH (22), and DNS (53). Registered Ports (1024–49151) are used by databases and developer tools like PostgreSQL (5432), Redis (6379), and Node.js dev servers (3000). Dynamic or Private Ports (49152–65535) are used for temporary ephemeral connections.
The SHRTX Common Port Reference offers instantaneous offline search across well-known and registered developer ports, highlighting security vulnerabilities (such as unencrypted protocol risks) and generating terminal diagnostic commands (`lsof -i`, `netstat`, `fuser`).
Core Tool Capabilities
- Instant Search & Filtering: Search ports by number, service name, category (Database, Web, DevOps), or protocol.
- Security Vulnerability Notes: Highlights unencrypted protocol risks and default password vulnerability advisories.
- CLI Inspection Commands: Copy-paste `lsof -i :PORT`, `netstat -tulnp`, and `fuser` commands to kill or inspect process bindings.
- Offline IANA Registry: Fully embedded local port database for rapid developer lookup without internet reliance.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Resolving 'Port Already in Use' Errors
- • Firewall & Security Group Configuration
- • Microservice Network Architecture
Technical Specifications & Platform Limits
IANA standard port classification numbers
Transport layer network protocols
No network telemetry or socket probes
Step-by-Step Workflow
Search or Filter
Type a port number (e.g. 5432) or service name (e.g. Redis, SSH), or filter by category.
Select Port Entry
Click any port item from the result table to load comprehensive protocol metadata.
Review Security Notes
Check for unencrypted plaintext transmission risks or default security warnings.
Copy Inspection CLI
Copy `lsof` or `netstat` commands to identify which process is currently bound to that port.
Practical Real-World Use Cases
Resolving 'Port Already in Use' Errors
Developers quickly copy `lsof -i :PORT` or `fuser -k PORT/tcp` to free up blocked development ports.
Firewall & Security Group Configuration
Developers reference standard port numbers when configuring AWS Security Groups, Docker networks, or UFW rules.
Microservice Network Architecture
Developers assign non-conflicting default ports across microservices, databases, and message brokers.
Frequently Asked Questions
- How do I find out what process is using a port on macOS or Linux?
- Run `lsof -i :<PORT>` in your terminal to see the Process Name and PID. To force-terminate the process, run `kill -9 <PID>` or `fuser -k <PORT>/tcp`.
- What is the difference between TCP and UDP ports?
- TCP is a connection-oriented protocol that guarantees packet delivery and order (used for web browsing, databases, SSH). UDP is connectionless and prioritized for speed (used for DNS, video streaming, gaming).
- Does this tool scan or probe my local computer's network?
- No. This tool operates entirely as a local static reference database. It does not perform network port scans, socket probes, or external requests.
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