api: YAML JSON TOON Database
version: 1.0.0
format: json
dataset:
  slug: network-ports-reference
  title: Common Network Ports
  description: Well-known TCP and UDP ports for common network services.
  summary: "Default port numbers and transport protocols for the services that account for most real traffic and most firewall rules: web, mail, remote access, name resolution, directory, file sharing, messaging and common databases. Each row gives the number, whether it is TCP or UDP, the service and what it is for."
  use_when[2]: "You are writing or reviewing firewall, security-group or network-policy rules.",You need to recognize a service from a port number in a log or a scan.
  caveats[2]: "These are default assignments. Any service can be moved to another port, and a port number alone does not prove what is listening.",Several services use more than one port or both transports; the row lists the primary default.
  related[3]: tcp-ip-protocol-suite,dns-fundamentals,network-security-devices
  category: Networking
  category_slug: networking
  tags: "networking,ports,tcp,udp,reference"
  view_count: 0
  sources[1]{title,url}:
    IANA service name and port registry,"https://www.iana.org/assignments/service-names-port-numbers/"
  reading[1]: common-network-ports-reference
  reviewed_at: 2026-10-12
  updated_at: 1791799373
  provenance: "Original editorial reference notes by YJTOON, informed by the linked primary documentation. External specifications retain their own licenses."
  entry_count: 45
  fields[4]{section,field,type,example}:
    data,port,integer,"21"
    data,protocol,string,TCP
    data,service,string,FTP
    data,description,string,File Transfer Protocol - unencrypted file trans…
data[45]{port,protocol,service,description}:
  21,TCP,FTP,File Transfer Protocol - unencrypted file transfers.
  22,TCP,SSH,Secure Shell - encrypted remote access.
  25,TCP,SMTP,Simple Mail Transfer Protocol - email routing.
  53,TCP/UDP,DNS,Domain Name System - hostname to IP resolution.
  80,TCP,HTTP,Hypertext Transfer Protocol - unencrypted web traffic.
  443,TCP,HTTPS,HTTP over TLS - encrypted web traffic.
  3306,TCP,MySQL,MySQL database server - default port.
  5432,TCP,PostgreSQL,PostgreSQL database server - default port.
  6379,TCP,Redis,Redis in-memory data store - default port.
  8080,TCP,HTTP Alt,Common alternate port for HTTP proxies and dev servers.
  27017,TCP,MongoDB,MongoDB default port for standalone and replica set nodes.
  20,TCP,FTP data,Data channel for active-mode FTP transfers.
  23,TCP,Telnet,Unencrypted remote terminal access; replaced by SSH.
  67,UDP,DHCP server,Dynamic Host Configuration Protocol server side; clients use UDP 68.
  69,UDP,TFTP,"Trivial File Transfer Protocol, used for network booting and device firmware."
  110,TCP,POP3,"Post Office Protocol v3 mail retrieval, unencrypted."
  123,UDP,NTP,Network Time Protocol clock synchronization.
  143,TCP,IMAP,"Internet Message Access Protocol mailbox access, unencrypted or upgraded with STARTTLS."
  161,UDP,SNMP,Simple Network Management Protocol queries to network devices.
  389,TCP,LDAP,"Lightweight Directory Access Protocol, unencrypted or upgraded with StartTLS."
  445,TCP,SMB,Server Message Block file and printer sharing on Windows networks.
  465,TCP,SMTPS,SMTP over implicit TLS for mail submission.
  514,UDP,Syslog,Traditional transport for syslog log messages.
  587,TCP,SMTP submission,"Authenticated mail submission, normally upgraded with STARTTLS."
  636,TCP,LDAPS,LDAP over implicit TLS.
  853,TCP,DNS over TLS,Encrypted DNS queries between a client and a resolver.
  993,TCP,IMAPS,IMAP over implicit TLS.
  995,TCP,POP3S,POP3 over implicit TLS.
  1433,TCP,Microsoft SQL Server,Default listener of SQL Server.
  1521,TCP,Oracle Database,Default Oracle Net listener.
  1883,TCP,MQTT,"Lightweight publish/subscribe messaging for IoT, unencrypted."
  2049,TCP,NFS,Network File System.
  3389,TCP,RDP,Windows Remote Desktop Protocol.
  5060,TCP/UDP,SIP,Session Initiation Protocol signaling for VoIP.
  5672,TCP,AMQP,"Advanced Message Queuing Protocol, the default for RabbitMQ."
  5900,TCP,VNC,Virtual Network Computing remote desktop.
  6443,TCP,Kubernetes API server,Default secure port of the Kubernetes API server.
  8443,TCP,HTTPS alternate,Common alternative port for HTTPS services and admin consoles.
  8883,TCP,MQTT over TLS,MQTT with TLS encryption.
  9092,TCP,Apache Kafka,Default broker listener for Kafka.
  9200,TCP,Elasticsearch HTTP,REST API of Elasticsearch.
  11211,TCP,Memcached,Default port of the memcached cache server.
  443,UDP,HTTP/3,Common port for HTTP/3 over QUIC. Distinct transport from HTTPS over TCP.
  989,TCP,FTPS data,Registered data service for implicit FTP over TLS; explicit FTP TLS upgrades often use port 21.
  990,TCP,FTPS control,Registered control service for implicit FTP over TLS. Confirm server mode before configuring a firewall.