ports.md

All

21    : FTP (File Transfer Protocol)
22    : SSH (Secure Shell)
23    : Telnet (Protocol)
25    : SMTP (Simple Mail Transfer Protocol)
53    : DNS (Domain Name System)
80    : HTTP (Hypertext Transfer Protocol)
110   : POP3 (Post Office Protocol)
143   : IMAP (Internet Message Access Protocol)
389   : LDAP (Lightweight Directory Access Protocol)
443   : HTTPS (HTTP Secure)
636   : LDAPS (LDAP over SSL/TLS)
993   : IMAPS (IMAP over SSL)
995   : POP3S (POP3 over SSL)

1433  : Microsoft SQL Server
1883  : MQTT (Message Queuing Telemetry Transport)
2375  : Docker (non-TLS)
2376  : Docker (TLS)
2380  : etcd (cluster communication)

3000  : Rails (Ruby framework)
3000  : Next.js (JavaScript frameworks)
3000  : Nuxt.js (JavaScript frameworks)
3260  : iSCSI (Internet Small Computer Systems Interface)
3306  : MySQL
4000  : Phoenix (Elixir framework)
4194  : cAdvisor (container monitoring)
5000  : Express.js (Node.js framework)
5000  : Flask (Python framework)
5001  : TCP (FileMaker Server)
5432  : PostgreSQL
5601  : Kibana
5672  : RabbitMQ
6379  : Redis
6443  : Kubernetes API server
8000  : Django (Python framework)
8000  : FastAPI (Python framework)
8080  : HTTP (alternative, often used for web servers or testing)
8080  : Spring Boot (Java framework default)
8080  : Angular (JavaScript framework)
9000  : Play (Scala framework)
9092  : Apache Kafka
9200  : Elasticsearch
10000 : Webmin (web-based administration)
11211 : Memcached
15672 : RabbitMQ Management Plugin (Web UI)
27017 : MongoDB

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Separated

Common Internet Protocols:

21    : FTP (File Transfer Protocol)
22    : SSH (Secure Shell)
23    : Telnet (Protocol)
25    : SMTP (Simple Mail Transfer Protocol)
53    : DNS (Domain Name System)
80    : HTTP (Hypertext Transfer Protocol)
110   : POP3 (Post Office Protocol)
143   : IMAP (Internet Message Access Protocol)
389   : LDAP (Lightweight Directory Access Protocol)
443   : HTTPS (HTTP Secure)
636   : LDAPS (LDAP over SSL/TLS)
993   : IMAPS (IMAP over SSL)
995   : POP3S (POP3 over SSL)

Database Services:

1433  : Microsoft SQL Server
2375  : Docker (non-TLS)
2376  : Docker (TLS)
3306  : MySQL
5432  : PostgreSQL
27017 : MongoDB
11211 : Memcached

Message brokers:

1883  : MQTT (Message Queuing Telemetry Transport)
5672  : RabbitMQ
15672 : RabbitMQ Management Plugin (Web UI)
9092  : Apache Kafka

Container and Cluster Management:

2380  : etcd (cluster communication)
4194  : cAdvisor (container monitoring)
6443  : Kubernetes API server

Web Development Frameworks:

3000  : Rails, Next.js, Nuxt.js
4000  : Phoenix
5000  : Express.js, Flask
8000  : Django, FastAPI
8080  : Spring Boot, Angular
9000  : Play

Search and Monitoring Tools:

5601  : Kibana
9200  : Elasticsearch
10000 : Webmin (web-based administration)

Storage and Miscellaneous:

3260  : iSCSI (Internet Small Computer Systems Interface)