Network Time Protocol (NTP)-used for time synchronization Network News Transfer Protocol(NNTP)-used for retrieving newsgroup messages Ident-user identification system, used by IRC servers to identify users ISO-TSAP (Transport Service Access Point) Class 0 protocolĪCR/NEMA Digital Imaging and Communications in Medicine XNS (Xerox Network Systems) Clearinghouseīootstrap Protocol (BOOTP) Server also used by Dynamic Host Configuration Protocol(DHCP)īootstrap Protocol (BOOTP) Client also used by Dynamic Host Configuration Protocol(DHCP)ĭnsix (DoD Network Security for Information Exchange) Securit Attribute Token Map XNS (Xerox Network Systems) Time Protocol Nameserver, ARPA Host Name Server Protocol Resource Location Protocol(RLP)-used for determining the location of higher level services from hosts on a network Remote File (RF)-used to transfer files between machines Simple Mail Transfer Protocol(SMTP)-used for e-mail routing between mail servers Telnet protocol-unencrypted text communications Secure Shell(SSH)-used for secure logins, file transfers(scp, sftp) and port forwarding The contact port is sometimes called the "well-known port"." Port This list specifies the port used by the server process as its contact port. For the purpose of providing services to unknown callers, a service contact port is defined. Ports are used in the TCP to name the ends of logical connections which carry long term conversations. The following are a list of well-known and registered ports:Īccording to IANA "The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users. Some common port numbers are 80 for web (HTTP), 25 for email (SMTP), and 53 for Dmain Name System (DNS). Both TCP and UDP use ports to identify services. A port is just a number assigned to each application to identify that service on that computer. Since a computer might have multiple applications running on the same IP address, ports allow a computer to tell the differences from services such as email data from web data. Whereas IP makes two computers to communicate with each other across the Internet, TCP and UDP make the individual applications or services on those computers to communicate with to each other.
TCP, Transmission Control Protocol, and UDP, User Datagram Protocol, are both protocols which use IP. Common network ports, well-known ports, registered tcp, udp portsĬommon network ports, well-known & registered tcp & udp ports
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