Application Layer Protocols And Port Numbers

Front 1

FTP - File Transfer Protocol transfers files between clients and servers.

Back 1

TCP 20(DATA) 21(CONTROL)

Front 2

SSH & SCP Secure Shell & Secure Copy. A replacement for Telnet and FTP using encryption vs. clear text.

Back 2

TCP 22

Front 3

Telnet allows a user to log in remotely and execute commands on a remote host.

Back 3

TCP 23

Front 4

SMTP Simple Mail Transfer Protocol for sending mail server to server or client to server.

Back 4

TCP 25

Front 5

DNS - Domain Name Service for domain name resolution.

Back 5

TCP and UDP 53

Front 6

TFTP - Trivial File Transfer Protocol transfers files between servers and client without requiring and user login.

Back 6

UDP 69

Front 7

HTTP - Hypertext Transfer Protocol for web browser connections.

Back 7

TCP 80

Front 8

POP3 - Post Office Protocol -Email clients retrieve email from servers

Back 8

TCP 110

Front 9

NNTP - Network News Transfer Protocol transfers news group messages.

Back 9

UDP 119

Front 10

NTP - Network Time Protocol - synchronize the time clock on TCP/IP hosts.

Back 10

UDP 123

Front 11

NetBIOS Name Service for Microsoft File and Print Sharing

Back 11

TCP 137

Front 12

NetBIOS Datagram Service for Microsoft File and Print Sharing

Back 12

TCP 138

Front 13

NetBIOS Session Service for Microsoft File and Print Sharing

Back 13

TCP 139

Front 14

IMAP - Internet Message Access Protocol to access email messages while leaving them on the server

Back 14

TCP 143

Front 15

SNMP - Simple Network Management Protocol for Network management to remotely monitor network devices

Back 15

UDP 161

Front 16

LDAP - Lightweight Directory Access Protocol to search and update information in directories.

Back 16

TCP 389

Front 17

HTTPS - HTTP over SSL (Secure Sockets Layer) for encrypted web browser connections

Back 17

TCP 443

Front 18

Raw SMB - When NetBIOS support is disabled, Microsoft File and Print Sharing uses this port.

Back 18

TCP 445

Front 19

IGMP - Internet Group Multicast Protocol to register as members of a multicast group.

Back 19

UDP 463

Front 20

LPR - Line Printer Protocol used to communicate between LPR client and LPD Line Printer Daemon Server. Typically Unix/Linux.

Back 20

TCP 515