What are well-known ports?

Well-known ports are port numbers from 0 to 1023, assigned by IANA to common services and protocols. For example, port 80 is HTTP, port 443 is HTTPS, port 22 is SSH, and port 25 is SMTP.

What is the difference between TCP and UDP ports?

TCP (Transmission Control Protocol) provides reliable, ordered, error-checked delivery and is used for HTTP, SSH, FTP. UDP (User Datagram Protocol) is connectionless and faster, used for DNS, DHCP, streaming, and VoIP where speed matters more than reliability.

What are registered and dynamic ports?

IANA divides ports into three ranges: well-known (0–1023), registered (1024–49151) for applications, and dynamic/ephemeral (49152–65535) assigned by the OS for temporary client-side connections.

Port Number Reference

Searchable reference of well-known TCP/UDP port numbers and their services.

85 ports shown

PortProtoServiceDescription

1TCPtcpmuxTCP Port Service Multiplexer

7TCP/UDPechoEcho protocol

9TCP/UDPdiscardDiscard protocol / Wake-on-LAN (UDP)

13TCP/UDPdaytimeDaytime protocol

20TCPftp-dataFTP data transfer

21TCPftpFTP control (command)

22TCPsshSecure Shell (SSH)

23TCPtelnetTelnet protocol

25TCPsmtpSimple Mail Transfer Protocol

37TCP/UDPtimeTime protocol

43TCPwhoisWHOIS directory service

53TCP/UDPdnsDomain Name System

67UDPdhcpDHCP server

68UDPdhcpDHCP client

69UDPtftpTrivial File Transfer Protocol

70TCPgopherGopher protocol

79TCPfingerFinger protocol

80TCPhttpHypertext Transfer Protocol

88TCP/UDPkerberosKerberos authentication

110TCPpop3Post Office Protocol v3

111TCP/UDPrpcbindONC RPC portmapper

119TCPnntpNetwork News Transfer Protocol

123UDPntpNetwork Time Protocol

135TCP/UDPmsrpcMicrosoft RPC endpoint mapper

137TCP/UDPnetbios-nsNetBIOS Name Service

138UDPnetbios-dgmNetBIOS Datagram Service

139TCPnetbios-ssnNetBIOS Session Service

143TCPimapInternet Message Access Protocol

161UDPsnmpSimple Network Management Protocol

162TCP/UDPsnmptrapSNMP Trap

179TCPbgpBorder Gateway Protocol

194TCPircInternet Relay Chat

389TCP/UDPldapLightweight Directory Access Protocol

443TCPhttpsHTTP over TLS/SSL

445TCPsmbSMB / Microsoft-DS

465TCPsmtpsSMTP over TLS/SSL (legacy)

500UDPisakmpIKE / IPsec (ISAKMP)

514UDPsyslogSyslog protocol

515TCPlpdLine Printer Daemon

520UDPripRouting Information Protocol

554TCP/UDPrtspReal Time Streaming Protocol

587TCPsubmissionEmail message submission (SMTP)

636TCPldapsLDAP over TLS/SSL

666TCP/UDPdoomDoom game multiplayer

853TCPdns-over-tlsDNS over TLS (DoT)

873TCPrsyncrsync file synchronization

902TCPvmwareVMware ESXi host management

989TCPftps-dataFTPS data (FTP over TLS)

990TCPftpsFTPS control (FTP over TLS)

993TCPimapsIMAP over TLS/SSL

995TCPpop3sPOP3 over TLS/SSL

1080TCPsocksSOCKS proxy

1194UDPopenvpnOpenVPN

1433TCPms-sqlMicrosoft SQL Server

1521TCPoracleOracle database

1723TCPpptpPPTP VPN

2049TCP/UDPnfsNetwork File System

2181TCPzookeeperApache ZooKeeper

2375TCPdockerDocker daemon (unencrypted)

2376TCPdocker-tlsDocker daemon (TLS)

3000TCPdev-serverCommon dev server port (Node, React, etc.)

3306TCPmysqlMySQL database

3389TCPrdpRemote Desktop Protocol (RDP)

4443TCPalt-httpsAlternate HTTPS

5000TCPdev-serverFlask / common dev server port

5432TCPpostgresqlPostgreSQL database

5601TCPkibanaKibana (Elastic Stack)

5900TCPvncVirtual Network Computing (VNC)

6379TCPredisRedis in-memory data store

6443TCPkubernetesKubernetes API server

7001TCPweblogicOracle WebLogic Server

8080TCPhttp-altAlternate HTTP / Tomcat

8443TCPhttps-altAlternate HTTPS

8888TCPjupyterJupyter Notebook

9000TCPphp-fpmPHP-FPM / SonarQube

9090TCPprometheusPrometheus monitoring

9092TCPkafkaApache Kafka

9200TCPelasticsearchElasticsearch REST API

9300TCPelasticsearchElasticsearch cluster communication

11211TCP/UDPmemcachedMemcached

15672TCPrabbitmqRabbitMQ management UI

27017TCPmongodbMongoDB database

27018TCPmongodbMongoDB shard server

50000TCPjenkinsJenkins agent

51820UDPwireguardWireGuard VPN

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FAQ

What are well-known ports?: Well-known ports are port numbers from 0 to 1023, assigned by IANA to common services and protocols. For example, port 80 is HTTP, port 443 is HTTPS, port 22 is SSH, and port 25 is SMTP.
What is the difference between TCP and UDP ports?: TCP (Transmission Control Protocol) provides reliable, ordered, error-checked delivery and is used for HTTP, SSH, FTP. UDP (User Datagram Protocol) is connectionless and faster, used for DNS, DHCP, streaming, and VoIP where speed matters more than reliability.
What are registered and dynamic ports?: IANA divides ports into three ranges: well-known (0–1023), registered (1024–49151) for applications, and dynamic/ephemeral (49152–65535) assigned by the OS for temporary client-side connections.

A searchable, filterable reference of well-known and commonly used port numbers (1–1024+). Displays port number, protocol (TCP/UDP/both), service name, and description for ~100 common ports. Useful for network configuration, firewall rules, and security auditing.