Port Number Reference
Search 108 standard network port mappings by service name, transport protocol, and category. Look up ports quickly, copy details, and export filtered results for network operations and security workflows.
Look up standard services by port number, filter by transport and category, and inspect common usage notes for firewall rules, monitoring checks, and network troubleshooting.
Enter a single port number for exact match.
Search by service, alias, category, or description.
Filtered services
108
Well-known ports
44
Database services
12
Select an entry to inspect service behavior and copy quick lookup details.
Port and service
20 - FTP Data
Description
File Transfer Protocol data channel.
Common use
Active mode data transfer for FTP.
Accuracy note
Port mappings can vary by vendor and environment. Use this reference as a fast baseline and validate service bindings against your host, firewall, and application configuration before production changes.
Secure web entries in current filter: 2
Why Use This Port Number Reference?
Fast, practical lookup for operations, security, and infrastructure workflows.
Instant lookup by number or keyword
Find port mappings quickly by exact number, service name, category, or transport protocol without leaving your browser.
Secure and private workflow
Searches and filters run fully on-device. Your queries and operational notes are not sent to backend processing services.
Copy and export ready
Copy specific ports or export full filtered CSV lists for firewall rule reviews, change tickets, and runbook updates.
Free forever, no signup required
Use the tool without account setup, usage caps, or installation steps across desktop and mobile browsers.
Common Use Cases
How teams use port mapping references in real network operations.
Firewall and security group planning
Security teams can confirm expected service ports before creating inbound or outbound firewall rules across environments.
Incident and outage troubleshooting
Operations teams can quickly map a failing port check to likely service ownership during network incidents.
Server hardening baselines
Platform engineers can review exposed ports and align host baselines with approved service expectations.
Monitoring and synthetic checks
SRE teams can build targeted health checks by matching standard service ports and transport protocols.
Secure service migration
Developers can compare legacy ports with TLS alternatives when migrating to more secure endpoint configurations.
Team onboarding and runbooks
New engineers can use the reference as a practical lookup when reading network diagrams and runbooks.
Frequently Asked Questions
Essential notes about port ranges, conventions, and operational safety.
What is a port number reference?+
A port number reference maps numeric ports to commonly associated services, such as 443 to HTTPS or 22 to SSH. It helps with firewall planning, troubleshooting, and monitoring setup.
Can multiple services use the same port?+
Yes. Port assignments are conventions, not guarantees. Different applications can use the same port on different hosts, and custom deployments may run services on non-standard ports.
What is the difference between well-known and registered ports?+
Well-known ports are 0 to 1023 and are traditionally reserved for core services. Registered ports are 1024 to 49151, while dynamic/private ports are 49152 to 65535 and are often used ephemerally.
Should I open a port just because it has a known service?+
No. Always apply least-privilege network rules. Open only ports required by your workloads and verify source restrictions, encryption settings, and service hardening policies.
Is this tool free and private?+
Yes. The port number reference is 100% free, runs in your browser, and does not require signup or account creation.
Related Tools
JSON to YAML
Convert JSON to YAML format instantly - Free online JSON to YAML converter
XML to YAML
Convert XML to YAML format for configuration migration - Free online XML to YAML converter
CSV to YAML
Convert CSV spreadsheet data to YAML format - Free online CSV to YAML converter
TSV to YAML
Convert TSV tab-separated data to YAML format - Free online TSV to YAML converter