Default ports for major products and services

Web Services
    HTTP: 80
    HTTPS: 443
    HTTP/3 (QUIC): 443

Database Systems
    MySQL: 3306
    PostgreSQL: 5432
    MongoDB: 27017
    Redis: 6379
    Microsoft SQL Server: 1433
    Oracle Database: 1521
    Cassandra: 9042
    CouchDB: 5984
    InfluxDB: 8086
    Elasticsearch: 9200

Message Brokers & Queues
    Apache Kafka: 9092
    RabbitMQ: 5672 (AMQP), 15672 (Management UI)
    Apache ActiveMQ: 61616
    Amazon SQS: 443 (HTTPS)

Application Servers & Frameworks
    Apache Tomcat: 8080
    Jetty: 8080
    Node.js (Express): 3000 (common default)
    Django: 8000
    Flask: 5000
    Spring Boot: 8080
    Ruby on Rails: 3000

Email Services
    SMTP: 25 (unencrypted), 587 (TLS), 465 (SSL)
    POP3: 110 (unencrypted), 995 (SSL)
    IMAP: 143 (unencrypted), 993 (SSL)
    
File Transfer & Remote Access
    FTP: 21
    SFTP/SSH: 22
    Telnet: 23
    RDP (Remote Desktop): 3389
    VNC: 5900

DNS & Network Services
    DNS: 53
    DHCP: 67/68
    SNMP: 161
    NTP: 123
    LDAP: 389 (unencrypted), 636 (SSL)

Cloud & Container Services
    Docker: 2376 (secure), 2375 (insecure)
    Kubernetes API: 6443
    etcd: 2379 (client), 2380 (peer)
    Consul: 8500
    Vault: 8200

Monitoring & Observability
    Prometheus: 9090
    Grafana: 3000
    Jaeger: 16686 (UI), 14268 (collector)
    Zipkin: 9411
    New Relic: 443

Development Tools
    Jenkins: 8080
    GitLab: 80/443
    SonarQube: 9000
    Nexus Repository: 8081
    JFrog Artifactory: 8081

Gaming & Entertainment
    Minecraft: 25565
    Steam: 27015
    Discord: 443

IoT & Smart Home
    MQTT: 1883 (unencrypted), 8883 (SSL)
    CoAP: 5683