UDPpoort
UDPpoort is the numeric port used by the User Datagram Protocol (UDP) to demultiplex datagrams to the appropriate application on a host. UDPport numbers are 16-bit values, allowing a range from 0 to 65535. Port 0 is reserved and should not be used by applications; some systems permit binding to port 0 to request an ephemeral port assigned by the operating system. The remaining range is divided into well-known ports (0–1023), registered ports (1024–49151), and dynamic/private ports (49152–65535). Well-known ports are typically associated with widely used services, such as DNS at port 53.
A UDP datagram contains a header with four 16-bit fields: source port, destination port, length, and checksum.
UDP is a connectionless protocol. It does not establish or maintain a connection, nor does it guarantee
Common uses of UDPport include domain name system queries, DHCP, SNMP, and real-time media or gaming traffic.
See also: UDP, TCP ports, network sockets, firewall considerations.