TCP/UDP Port Reference
Common TCP and UDP ports and the services that use them — with transport, purpose and security notes for each. Click any port for the full page.
Common ports
Port 20 · FTP dataPort 21 · FTP controlPort 22 · SSHPort 23 · TelnetPort 25 · SMTPPort 37 · TimePort 43 · WHOISPort 49 · TACACS+Port 53 · DNSPort 67 · DHCP serverPort 68 · DHCP clientPort 69 · TFTPPort 80 · HTTPPort 88 · KerberosPort 110 · POP3Port 111 · RPCbindPort 119 · NNTPPort 123 · NTPPort 135 · MS RPCPort 137 · NetBIOS namePort 138 · NetBIOS datagramPort 139 · NetBIOS sessionPort 143 · IMAPPort 161 · SNMPPort 162 · SNMP trapPort 179 · BGPPort 194 · IRCPort 389 · LDAPPort 443 · HTTPSPort 445 · SMBPort 465 · SMTPSPort 500 · IKE / IPsecPort 514 · SyslogPort 515 · LPDPort 520 · RIPPort 587 · SMTP submissionPort 636 · LDAPSPort 646 · LDPPort 993 · IMAPSPort 995 · POP3SPort 1080 · SOCKS proxyPort 1194 · OpenVPNPort 1433 · MS SQLPort 1434 · MS SQL monitorPort 1521 · Oracle DBPort 1701 · L2TPPort 1723 · PPTPPort 1812 · RADIUS authPort 1813 · RADIUS acctPort 2049 · NFSPort 2082 · cPanelPort 2083 · cPanel SSLPort 3128 · Squid proxyPort 3268 · Global CatalogPort 3306 · MySQLPort 3389 · RDPPort 3690 · SubversionPort 4500 · IPsec NAT-TPort 5060 · SIPPort 5061 · SIP-TLSPort 5432 · PostgreSQLPort 5900 · VNCPort 5985 · WinRM HTTPPort 5986 · WinRM HTTPSPort 6379 · RedisPort 8080 · HTTP altPort 8443 · HTTPS altPort 8888 · HTTP altPort 9090 · Web adminPort 9200 · ElasticsearchPort 11211 · MemcachedPort 27017 · MongoDB
Why ports matter
Ports let one host run many services at once — a web server on 443, SSH on 22, DNS on 53. Firewalls and ACLs allow or block traffic by port, which is why knowing them is core to networking and security. Learn firewall filtering in the CyberOps course.
Frequently asked questions
What is a network port?
A port is a 16-bit number (0–65535) that identifies a specific service on a host, so multiple services can share one IP address. HTTPS uses 443, SSH uses 22, DNS uses 53.
What is the difference between TCP and UDP ports?
TCP ports are for connection-oriented, reliable delivery (web, email); UDP ports are for connectionless, low-latency traffic (DNS queries, VoIP, DHCP). Some services use both.
Which ports are the most security-sensitive?
RDP (3389), SMB (445), Telnet (23), and database ports like 3306 and 1433 should never be exposed to the internet — they are common breach vectors.
Related
Learn networking hands-on
Master IP addressing, subnetting and Cisco configuration on real lab devices with placement support at Attila Technologies, Ahmedabad.