Ports Cheatsheet
Updated Jan 16, 2019 ·
| Port | UDP/TCP | Service/Protocol | Description |
|---|---|---|---|
| 20 | TCP | FTP (File Transfer Protocol) Data | Transfers data in FTP |
| 21 | TCP | FTP (File Transfer Protocol) Control | Controls communication in FTP |
| 22 | TCP | SSH (Secure Shell) | Secure remote login and other secure network services over an unsecured network |
| 22 | TCP | SCP (Secure Copy Protocol) | Securely transfers files between hosts using SSH |
| 22 | TCP | SFTP (SSH File Transfer Protocol) | Secure file transfer over port 22 (SSH) |
| 990 | TCP | FTPS (File Transfer Protocol Secure) Control | Secure file transfer over port 990 |
| 23 | TCP | Telnet | Unencrypted text communications |
| 25 | TCP | SMTP (Simple Mail Transfer Protocol) | Email transmission |
| 49 | TCP | TACACS+ (Terminal Access Controller Access-Control System Plus) | Remote authentication |
| 53 | UDP/TCP | DNS (Domain Name System) | Resolves domain names to IP addresses |
| 67 | UDP | DHCP (Dynamic Host Configuration Protocol) Server | Assigns IP addresses to clients from a DHCP server |
| 68 | UDP | DHCP (Dynamic Host Configuration Protocol) Client | Client port for receiving IP configuration from DHCP server |
| 69 | UDP | TFTP (Trivial File Transfer Protocol) | Simple, unsecured file transfer |
| 80 | TCP | HTTP (Hypertext Transfer Protocol) | Web traffic; Insecure web browsing |
| 88 | UDP | Kerberos | Network Authentication Protocol |
| 110 | TCP | POP3 (Post Office Protocol 3) | Email retrieval from a server |
| 119 | TCP | NNTP (Network News Transfer Protocol) | Used for accessing news groups |
| 123 | UDP | NTP (Network Time Protocol) | Network time synchronization |
| 135 | UDP/TCP | RPC (Remote Procedure Call) | Facilitates communication between different system processes |
| 137 | UDP/TCP | NetBIOS | Networking protocol suite; Internal network names, file and printer sharing |
| 138 | UDP/TCP | NetBIOS | Networking protocol suite; Internal network names, file and printer sharing |
| 139 | UDP/TCP | NetBIOS | Networking protocol suite; Internal network names, file and printer sharing |
| 143 | TCP | IMAP (Internet Message Access Protocol) | Email retrieval |
| 161 | UDP | SNMP (Simple Network Management Protocol) | Network management and monitoring |
| 162 | UDP | SNMPTRAP (Simple Network Management Protocol Trap) | Sends alerts (trap messages) from SNMP devices |
| 389 | UDP/TCP | LDAP (Lightweight Directory Access Protocol) | Directory services |
| 443 | TCP | HTTPS (HTTP Secure) | Secure web traffic |
| 445 | TCP | SMB (Server Message Block) | Provides shared access to files and printers |
| 465 | TCP | SMTPS (Simple Mail Transfer Protocol Secure) | Secure email transmission |
| 587 | TCP | SMTPS (Simple Mail Transfer Protocol Secure) | Secure email transmission |
| 514 | UDP | Syslog | System logging |
| 636 | TCP | LDAPS (LDAP Secure) | Secure version of LDAP (Lightweight Directory Access Protocol) |
| 989 | TCP | FTPS (File Transfer Protocol Secure) Data | Secure file transfer data channel |
| 993 | TCP | IMAPS (Internet Message Access Protocol Secure) | Secure email retrieval using IMAP |
| 995 | TCP | POP3S (Post Office Protocol 3 Secure) | Secure email retrieval using POP3 |
| 1433 | TCP | MS-SQL-S (Microsoft SQL Server) | Microsoft SQL Server database management |
| 1645 | TCP | RADIUS TCP | Used for remote authentication, authorization, and accounting |
| 1646 | TCP | RADIUS TCP | Used for remote authentication, authorization, and accounting |
| 1812 | UDP | RADIUS Authentication | Authentication for network access |
| 1813 | UDP | RADIUS Accounting | Accounting for network access |
| 3260 | TCP | iSCSI (Internet Small Computer Systems Interface) Target | iSCSI targets for storage over IP networks |
| 3389 | TCP | RDP (Remote Desktop Protocol) | Remote desktop access |
| 5004 | UDP | SRTP (Secure Real-time Transport Protocol) | Voice over IP (VoIP) communication |
| 5060 | UDP/TCP | SIP (Session Initiation Protocol) | Voice over IP (VoIP) and multimedia communication (unencrypted) |
| 5061 | TCP | SIP-TLS (Session Initiation Protocol over TLS) | Secure VoIP and multimedia communication |
| 6514 | TCP | Syslog over TLS | Secure system logging |
| 8443 | TCP | HTTPS-alt | Alternative port for secure web traffic |