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Port Number Dictionary

Search well-known (0–1023), registered (1024–49151), and dynamic network ports used in Internet protocols. Filter by categories like Web, Database, Remote Access, and Cloud, and inspect TCP/UDP protocol specifications 100% locally in your browser.

Found 51 ports matching your query.

PORT

PROTOCOL

SERVICE

DESCRIPTION

TCP

FTP Data

File Transfer Protocol default port used for transferring actual file payloads in active mode.

TCP

FTP Control

File Transfer Protocol command and control channel for login credentials and directory commands.

TCPUDP

SSH / SFTP

Secure Shell (SSH) protocol for encrypted terminal access and secure file transfer (SFTP).

TCP

Telnet

Legacy unencrypted text communications for remote terminal administration.

TCP

SMTP

Simple Mail Transfer Protocol for MTA server-to-server email routing across the Internet.

TCPUDP

DNS

Domain Name System for translating human-readable domain names into IP addresses.

UDP

DHCP Server

Dynamic Host Configuration Protocol server port for distributing IP addresses to clients.

UDP

DHCP Client

DHCP client listener port receiving network configuration parameters from DHCP servers.

UDP

TFTP

Trivial File Transfer Protocol for automated firmware flashing and network PXE booting.

TCP

HTTP

HyperText Transfer Protocol for unencrypted plain-text web page communications.

110

TCP

POP3

Post Office Protocol v3 for downloading stored emails from server to local client devices.

123

UDP

NTP

Network Time Protocol for millisecond-precision server clock synchronization across networks.

143

TCP

IMAP

Internet Message Access Protocol for multi-device synchronized email inbox management.

161

UDP

SNMP

Simple Network Management Protocol agent query port for network device performance metrics.

389

TCPUDP

LDAP

Lightweight Directory Access Protocol for centralized corporate identity and directory lookups.

443

TCPUDP

HTTPS / HTTP/3

HyperText Transfer Protocol Secure over TLS/SSL and HTTP/3 QUIC for all secure web traffic.

445

TCP

SMB / CIFS

Server Message Block protocol for Microsoft Windows file and printer sharing services.

465

TCP

SMTPS

SMTP over TLS/SSL wrapper for secure outbound email submission from mail clients.

587

TCP

SMTP Submission

Standard email submission port enforcing client authentication and STARTTLS encryption.

636

TCP

LDAPS

Lightweight Directory Access Protocol over TLS for secure enterprise identity verification.

873

TCP

Rsync

Rsync background daemon port for high-speed delta-based remote backup and mirroring.

993

TCP

IMAPS

Encrypted IMAP protocol over TLS for secure mobile and desktop email synchronization.

995

TCP

POP3S

POP3 protocol with native TLS encryption wrapper for secure local mail retrieval.

1080

TCP

SOCKS Proxy

SOCKS5 proxy protocol port routing generic TCP/UDP socket connections through gateway servers.

1194

UDPTCP

OpenVPN

OpenVPN daemon default port for secure remote-access enterprise virtual private networks.

1433

TCP

Microsoft SQL Server

Microsoft SQL Server relational database management system default listener port.

1521

TCP

Oracle Database

Oracle Database TNS network listener port for SQL*Net client connections.

1883

TCP

MQTT

Message Queuing Telemetry Transport (MQTT) unencrypted broker port for IoT telemetry.

2049

TCPUDP

NFS

Network File System for mounting distributed storage directories across Linux servers.

2181

TCP

Apache ZooKeeper

Apache ZooKeeper client port for managing distributed consensus and configuration states.

2375

TCP

Docker Daemon (Plain)

Unencrypted Docker Engine REST API port for remote container lifecycle management.

2376

TCP

Docker Daemon (TLS)

Secure Docker Engine REST API port enforced with mutual TLS certificate authentication.

3000

TCP

Dev Server / Grafana

Default development server port for React, Next.js, and Grafana monitoring dashboards.

3306

TCP

MySQL / MariaDB

Default network port for MySQL and MariaDB relational database servers.

3389

TCPUDP

RDP

Microsoft Remote Desktop Protocol for managing graphical Windows workstations and servers.

5000

TCP

Flask / Express / Docker Reg

Python Flask, Express.js dev server, and Docker Private Registry distribution port.

5432

TCP

PostgreSQL

Default client connection port for PostgreSQL object-relational database servers.

5672

TCP

RabbitMQ (AMQP)

RabbitMQ Advanced Message Queuing Protocol (AMQP) primary messaging broker port.

5900

TCP

VNC Remote Desktop

Virtual Network Computing graphical desktop sharing protocol across diverse OS environments.

6379

TCP

Redis

Redis in-memory key-value database, caching layer, and pub/sub message broker default port.

8000

TCP

Django / FastAPI / HTTP Alt

Python Django development server, FastAPI uvicorn, and generic alternative HTTP web port.

8080

TCP

HTTP Alternate / Tomcat

Apache Tomcat, Spring Boot, Jenkins CI, and proxy servers default alternative HTTP port.

8443

TCP

HTTPS Alternate

HTTPS alternative port allowing unprivileged non-root daemons to bind secure TLS web services.

8888

TCP

Jupyter Notebook

Jupyter Notebook and JupyterLab interactive Python web data science dashboard port.

9000

TCP

PHP-FPM / MinIO / SonarQube

PHP-FPM FastCGI daemon, MinIO S3 object store, and SonarQube code quality server port.

9090

TCP

Prometheus

Prometheus cloud-native time-series metrics monitoring server web UI and query API.

9092

TCP

Apache Kafka

Apache Kafka distributed real-time event streaming cluster broker client port.

9200

TCP

Elasticsearch REST

Elasticsearch distributed search and log analytics engine HTTP REST API endpoint.

11211

TCPUDP

Memcached

Memcached high-performance distributed memory object caching system port.

15672

TCP

RabbitMQ Management

RabbitMQ web-based management UI dashboard for monitoring queues and throughput.

27017

TCP

MongoDB

MongoDB NoSQL document database server default client communication port.

100% Client-Side Privacy

Search queries and filters are processed entirely inside your local browser memory. No network requests are sent, ensuring complete confidentiality for sensitive port lookups.

Port Accessibility Diagnostic Tips

Verify whether a specific network port is listening or blocked by inspecting binding states and firewall policies.

Port 22 (SSH) Closed / Filtered

Port 443 (HTTPS) Open & Listening

Terminal Real-time Port Lookup

$ sudo netstat -tulpn

tcp 0 0 0.0.0.0:80 LISTEN

tcp 0 0 0.0.0.0:22 LISTEN

tcp 0 0 0.0.0.0:443 LISTEN

$ ss -tulpn | grep :3306

IANA Port Range Standards

0 – 1023: Well-Known Ports (Requires root privileges)

1024 – 49151: Registered Ports (Vendor assigned)

49152 – 65535: Dynamic / Ephemeral (Client outbound)

Network Architecture & Security Engineering Manual

Understanding Port Numbers in TCP/IP and Hardening Production Firewalls

In computer networking, a port number is a 16-bit logical unsigned integer (0 to 65535) used at the Transport Layer (TCP/UDP) to direct network packets to specific application processes running on a single host.

While an IP address identifies the destination server on the network, the port number designates the specific service (web server, database, SSH daemon) that should process the connection.

This technical guide covers TCP vs UDP protocol distinctions, IANA port range classifications, and essential firewall hardening strategies for cloud and on-premise deployments.

Over 60+ Production Network Ports

Comprehensive directory spanning Web, Database, Remote Access, Cloud Microservices, and Messaging brokers.

TCP & UDP Protocol Mapping

Clear breakdown between connection-oriented reliable TCP and low-latency connectionless UDP protocols.

Cross-Platform Port Commands

Ready-to-use netstat, lsof, ss, and PowerShell snippets for Linux, macOS, and Windows troubleshooting.

1. IANA Port Range Classification & Privilege Requirements

The 65,536 available port numbers are split into three official IANA categories based on usage and permission requirements:

Range Category	Port Span	Allocation Policy	OS Privilege Level	Example Services

2. Transport Protocols: TCP vs. UDP Architectural Differences

• TCP (Transmission Control Protocol): Establishes state via a 3-way handshake with ordered delivery, checksum verification, and retransmission of dropped packets. Essential for HTTP/HTTPS, SSH, FTP, and databases.

• UDP (User Datagram Protocol): Sends datagrams without handshakes or state tracking, minimizing packet overhead and latency. Ideal for DNS queries (53), VoIP, video conferencing, and multiplayer game servers.

3. Operating System Terminal Diagnostic Commands

Inspect active listening ports and binding processes across modern environments:

Frequently Asked Questions (FAQ)

Q.Why do ports below 1024 require root/administrator privileges to bind?

Well-known ports (0–1023) are reserved for fundamental system services. Requiring superuser privileges prevents standard unprivileged users or malware from spoofing standard system daemons (like SSH or HTTP) to intercept credentials.

Q.Can the same port number be used simultaneously by TCP and UDP?

Yes. TCP and UDP maintain completely independent port namespaces. A single host can run a TCP service and a UDP service on the exact same port number simultaneously (e.g. DNS uses both TCP 53 and UDP 53).

Q.Is changing default port numbers (e.g. SSH 22 to 2222) effective for security?

Changing default ports (Security through Obscurity) reduces noise from automated internet-wide scan bots, but it is not a complete defense. A simple port scan with nmap quickly identifies the actual service. True security requires firewall IP whitelisting, key authentication, and brute-force prevention tools like Fail2ban.

Q.What does port forwarding (-p 8080:80) mean in Docker containers?

It routes inbound traffic arriving on host port 8080 into port 80 inside the container. This allows multiple isolated containerized web servers to run simultaneously on a single machine across different external host ports.

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