Ciphers Security

Network Ports and their services

ports and services

This article will describe the most common network service and network ports. Ports are like small rooms in your whole house which is server.

Ports are responsible for every service running and executing on your server for user interaction. It is like the virtual point where network connections start and end.

These are software-based and managed by a computer’s OS. Each port is assigned a specific type of service or process that is only accessed by that port number.

Port Number

Every Port is assigned a specific identification number for their identification over the internet. These port numbers are fixed by IANA (Internet Assigned Number Authority) for global use.

Ports number and their service are standardized across all network-connected devices. Most of the ports are reserved for many types of protocols by the IANA service.

Port number and their service

Port NumberServiceProtocolDescription
7EchoTCP, UDPEcho service
20FTP-dataTCP, SCTPFile transfer protocol for data transfer
21FTPTCP, UDP, SCTPFile transfer protocol (FTP) control connection
22SSH-SCPTCP, UDP, SCTPSecure Shell, Secure Login, File Transfer (scp, sftp), and Port Forwarding
23TelnetTCPTelnet protocol-unencrypted text communications
25SMTPTCPSimple Mail Transfer Protocol, used for email routing between mail servers
53DNSTCP, UDP DNS name resolver
69TFTPUDPTrivial File Transfer Protocol
80HTTPTCP, UDP, SCTPHypertext Transfer Protocol (HTTP) uses TCP in versions 1.x and 2. 
HTTP/3 uses QUIC, a transport protocol on top of UDP
88KerberosTCP, UDPNetwork authentication system
102Iso-tsapTCPISO Transport Service Access Point (TSAP) Class 0 protocol
110POP3TCPPost Office Protocol, version 3 (POP3)
135Microsoft EPMAPTCP, UDPMicrosoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, is used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM
137NetBIOS-nsTCP, UDP NetBIOS Name Service, used for name registration and resolution
139NetBIOS-ssnTCP, UDPNetBIOS Session Service
143IMAP4TCP, UDPInternet Message Access Protocol (IMAP), management of electronic mail messages on a server
443HTTP over SSLTCP, UDP, SCTPHypertext Transfer Protocol Secure (HTTPS) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP.
464KerberosTCP, UDPKerberos Change/Set password
465SMTP over TLS/SSL, SSMTCPAuthenticated SMTP over TLS/SSL (SMTPS), URL Rendezvous Directory for SSM (Cisco protocol)
587SMTPTCPEmail message submission
593Microsoft DCOMTCP, UDPHTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server
636LDAP over TLS/SSLTCP, UDPLightweight Directory Access Protocol over TLS/SSL
691MS ExchangeTCPMS Exchange Routing
902VMware ServerunofficialVMware ESXi
989FTP over SSLTCP, UDPFTPS Protocol (data), FTP over TLS/SSL
990FTP over SSLTCP, UDPFTPS Protocol (control), FTP over TLS/SSL
993IMAP4 over SSLTCPInternet Message Access Protocol over TLS/SSL (IMAPS)
995POP3 over SSLTCP, UDPPost Office Protocol 3 over TLS/SSL
1025Microsoft RPCTCPMicrosoft operating systems tend to allocate one or more unsuspected, publicly exposed services (probably DCOM, but who knows) among the first handful of ports immediately above the end of the service port range (1024+).
1337WASTEunofficialWASTE Encrypted File Sharing Program
1589Cisco VQPTCP, UDPCisco VLAN Query Protocol (VQP)
1725SteamUDPValve Steam Client uses port 1725 
2082cPanelunofficialcPanel default
2083radsec, cPanelTCP, UDPSecure RADIUS Service (radsec), cPanel default SSL
2483Oracle DBTCP, UDPOracle database listening for insecure client connections to the listener, replaces port 1521
2484Oracle DBTCP, UDPOracle database listening for SSL client connections to the listener
2967Symantec AVTCP, UDPSymantec System Center agent (SSC-AGENT)
3074XBOX LiveTCP, UDPXbox LIVE and Games for Windows – Live
3306MySQLTCP MySQL database system
3724World of WarcraftTCP, UDPSome Blizzard games, Unofficial Club Penguin Disney online game for kids
4664Google DesktopunofficialGoogle Desktop Search
5432PostgreSQLTCPPostgreSQL database system
5900RFB/VNC ServerTCP, UDPvirtual Network Computing (VNC) Remote Frame Buffer RFB protocol
6665IRCTCPInternet Relay Chat 
6669IRCTCPInternet Relay Chat 
6881BitTorrentunofficialBitTorrent is part of the full range of ports used most often
6999BitTorrentunofficialBitTorrent is part of the full range of ports used most often
6970QuicktimeunofficialQuickTime Streaming Server
8086Kaspersky AVTCPKaspersky AV Control Center
8087Kaspersky AVUDPKaspersky AV Control Center
8222VMware ServerTCP, UDPVMware Server Management User Interface (insecure Web interface).
9100PDLTCPPDL Data Stream, used for printing to certain network printers[1]
10000BackupExecunofficialWebmin, Web-based Unix/Linux system administration tool (default port)
12345NetBusunofficialNetBus remote administration tool (often Trojan horse).
27374Sub7unofficialSub7 default
18006Back OrificeunofficialBack Orifice 2000 remote administration tools

Enumeration techniques on ports services

Below are the enumeration techniques that can be used for enumerating any port and its service. These are the major misconfiguration while the configuration of your network port that an attacker can further use to affect your network.

Ports and services to enumerate

Port NumberProtocolEnumeration Technique
25TCPSimple Mail Transfer Protocol (SMTP)
53TCP, UDPDNS Zone Transfer
135TCP, UDPMicrosoft RPC Endpoint Mapper
137UDPNetBIOS Name Service (NBNS)
139TCPNetBIOS Session Service (SMB over NetBIOS)
161UDPSimple Network Management Protocol (SNMP)
389TCP, UDPLightweight Directory Access Protocol (LDAP)
445TCP, UDPSMB over TCP (Direct Host)
3268TCP, UDPGlobal Catalog Service

If you have any queries regarding the above content, or you want to update anything in the content, then contact us with your queries. You can directly post your question in the group.

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