Port Numbers Flashcards
FTP
Tcp/20(Active Mode)
Tcp/21(Control)
The File Transfer Protocol is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network. FTP is built on a client–server model architecture using separate control and data connections between the client and the server
SSH
Tcp/22
The Secure Shell Protocol is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH applications are based on a client–server architecture, connecting an SSH client instance with an SSH server
Telnet
tcp/23
Telnet is a client/server application protocol that provides access to virtual terminals of remote systems on local area networks or the Internet. Telnet consists of two components: the protocol itself which specifies how two parties are to communicate and the software application that provides the service.
SMTP
tcp/25
The Simple Mail Transfer Protocol is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages.
DNS
udp/53 then tcp/53
The Domain Name System is a hierarchical and distributed naming system for computers, services, and other resources in the Internet or other Internet Protocol networks. It associates various information with domain names assigned to each of the associated entities
DHCP
udp/67 (Client to Server) udp/68 (Server to Client)
The Dynamic Host Configuration Protocol is a network management protocol used on Internet Protocol networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a client–server architecture.
TFTP
udp/69
Trivial File Transfer Protocol is a simple lockstep File Transfer Protocol which allows a client to get a file from or put a file onto a remote host. One of its primary uses is in the early stages of nodes booting from a local area network.
HTTP & HTTPS
HTTP tcp/80 HTTPS tcp/443
Hypertext Transfer Protocol Secure is an extension of the Hypertext Transfer Protocol. It uses encryption for secure communication over a computer network, and is widely used on the Internet. In HTTPS, the communication protocol is encrypted using Transport Layer Security or, formerly, Secure Sockets Layer.
POP3 & POP3S
POP3 tcp/110 POP3S tcp/995
In computing, the Post Office Protocol is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. Today, POP version 3 is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.
NetBIOS
udp/137 & tcp/137 udp/138 tcp/139
NetBIOS is an acronym for Network Basic Input/Output System. It provides services related to the session layer of the OSI model allowing applications on separate computers to communicate over a local area network. As strictly an API, NetBIOS is not a networking protocol.
IMAP &IMAPS
cp/143 IMAPS tcp/993
In computing, the Internet Message Access Protocol is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. IMAP is defined by RFC 9051.
SNMP
udp/161 (Queries) udp/162 (Traps/Alarms)
Simple Network Management Protocol(SNMP) is an application–layer protocol defined by the Internet Architecture Board (IAB) in RFC1157 for exchanging management information between network devices. It is a part of Transmission Control Protocol⁄Internet Protocol (TCP⁄IP) protocol suite.
LDAP
tcp/389 & udp/389
The Lightweight Directory Access Protocol is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol network.
SLP
tcp/427 & udp/427
The Service Location Protocol is a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration. SLP has been designed to scale from small, unmanaged networks to large enterprise networks
SMB/CIFS
tcp/445 Direct (New)
Server Message Block is a communication protocol originally developed in 1983 by Barry A. Feigenbaum at IBM and intended to provide shared access to files and printers across nodes on a network of systems running IBM’s OS/2. It also provides an authenticated inter-process communication mechanism.
