| –Protocol– | –Port– | –Transport– | Expanded Description |
| HTTP | 80 | TCP | Used for unencrypted transmission of web pages and data across the internet. |
| ————— | |||
| HTTPS | 443 | TCP | A secure version of HTTP that encrypts traffic using TLS/SSL to protect data. |
| ————— | |||
| FTP (Data) | 20 | TCP | Specifically used for the actual transfer of data files between a client and server. |
| ————— | |||
| FTP (Control) | 21 | TCP | Used for establishing the connection and sending commands between the client and server. |
| ————— | |||
| SFTP | 22 | TCP | A secure file transfer protocol that operates over an SSH connection to ensure data privacy. Note: If you were curios about why SFTP and SSH use the same port like I was.. SFTP is an extension of SSH and SFTP (SSH File Transfer Protocol) is not technically “FTP” at all. |
| ————— | |||
| SSH | 22 | TCP | Provides a secure, encrypted way to remotely log into and manage network devices and servers. |
| ————— | |||
| Telnet | 23 | TCP | An older protocol for remote login that sends data in plaintext, making it insecure for modern use. |
| ————— | |||
| SMTP | 25 | TCP | The standard protocol used for pushing or sending emails from a client to a server or between servers. |
| ————— | |||
| POP3 | 110 | TCP | Used for downloading emails from a server to a local client, typically deleting them from the server afterward. |
| ————— | |||
| IMAP | 143 | TCP | A more advanced email retrieval protocol that keeps messages synced across multiple devices and the server. |
| ————— | |||
| LDAP | 389 | TCP/UDP | A protocol used for accessing and maintaining distributed directory information services over a network. |
| ————— | |||
| LDAPS | 636 | TCP | The secure version of LDAP, which encrypts directory service traffic to protect authentication data. |
| ————— | |||
| DNS | 53 | TCP/UDP | Translates human-readable domain names (e.g., example.com) into numerical IP addresses. |
| ————— | |||
| DHCP (Server) | 67 | UDP | The server-side component that manages and assigns IP addresses to clients on a network. |
| ————— | |||
| DHCP (Client) | 68 | UDP | The client-side component used to request and receive IP configuration from a DHCP server. |
| ————— | |||
| TFTP | 69 | UDP | A simplified, low-overhead file transfer protocol often used for booting diskless workstations or config transfers. |
| ————— | |||
| SNMP (Request) | 161 | UDP | Used for collecting and organizing information about managed devices on IP networks for network management. |
| ————— | |||
| SQL Server (MSSQL) | 1433 | TCP | The default port for communication between client applications and Microsoft SQL Server databases. |
| ————— | |||
| Oracle Database | 1521 | TCP | The standard listener port used by Oracle Database to accept incoming client connection requests. |
Networking Protocols and Ports
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