Category: Blog

Your blog category

Networking Protocols and Ports

–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.

June 5, 2026