Common Ports Flashcards
FTP
20/21: File Transfer Protocol. Insecure File Transfer between two devices.
SSH
22: Secure Shell is a secure telnet session for logging into other systems, running programs and commands, and moving files from one system to another.
SFTP
22: Secure FTP. It’s encrypted file transfer.
Telnet
23: Insecure terminal that allows you to access resources of another machine, run commands, and remotely access a system.
SMTP
25: SEND email over the network with a spooled/queued message delivery.
DNS
53: Resolves hostnames to corresponding IP
DHCP
67,68: Automatically assigns device IP to a host/device for easier administration.
TFTP
69: Lightweight file transfer protocol for fast transfers and network booting.
HTTP
80: Insecure web communication for browsers and web servers.
POP3
110: Receiving email (Incoming mail). Older than IMAP.
NTP
123: Time protocol that is used for accuracy and synchronization.
NetBios
139: File/Printer Sharing protocol for windows.
IMAP
143: New(er) method of retrieving emails, now replacing POP3 as a better option. More security and can download only parts of a message.
SNMP
161,162: Used for network data collection and manipulation.
LDAP
389: Lightweight Directory Access Protocol. Directory services for devices and users for system administration. Query directory services such as AD DS.
HTTPS
443: Secure version of the web browsing/server protocol (TLS/SSL)
SMB
445: Server Message Block. Used for sharing access to files and printers and other communications between hosts(devices, etc.) on a network.
SYSLOG
514: System Logs. Display, sort, and search messages for troubleshooting and documentation. Read system messages from a switch or router, Use this port for a syslog server which track what’s happening (Can do time stamps, sequence, etc.)
SMTP TLS
587: Simple Mail Transfer Protocol TLS. Encrypts email when it’s sent and ensures secure delivery.
LDAPS
636: Secure version of LDAP over SSL. Suggested over port 386. Must install proper certificate to get it to work from a CA.
IMAP / SSL
993: Secure IMAP with SSL.
POP3 / SSL
995: Secure POP3 with SSL.
SQL
1433: Microsoft SQL default port number for client systems.
SQLnet
1521: Oracle’s SQL default port number for remote data access. No longer needed.
MySQL
3306: Open source SQL server for same use case as the other SQL ports.
RDP
- Remote Desktop Protocol. Microsoft developed protocol that allows GUI and remote control of a device.
SIP
5060(TCP or UDP)/5061(TCP): Signaling protocol for VOIP and video calls and multimedia communication sessions. (Video conference, streams, IM, online games, etc.)
