ANSWER: Port numbers range from 0 to 65535 and are divided by IANA into three types: * well-known ports-Range from 0 to 1023 and are assigned by IANA to widely used and well-known utilities and applications, such as Telnet, FTP, and HTTP.

Internet Assigned Numbers Authority (IANA) Founded: 1988; 32 years ago (): Founder: U.S. Federal Government: An Opte Project visualization of routing paths through a portion of the Internet IANA Allocation Guidelines for TCP and UDP Port Numbers draft-cotton-tsvwg-iana-ports-00 Status of this Memo. By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Port number. A port number is a 16-bit unsigned integer, thus ranging from 0 to 65535. For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port.A process associates its input or output channels via an Internet socket, which is a type of file descriptor, with a transport protocol, an IP address, and a port number. A registered port is a network port (a sub-address defined within the Internet Protocol, in the range 1024-49151) assigned by the Internet Assigned Numbers Authority (IANA) (or by Internet Corporation for Assigned Names and Numbers (ICANN) before March 21, 2001, or by USC/ISI before 1998) for use with a certain protocol or application.. Ports with numbers 0-1023 are called system or well

The Internet Assigned Numbers Authority (IANA) assigns port numbers. IANA is a standards body that is responsible for assigning various addressing standards. There are different types of port numbers: Well Known Ports (Numbers 0 to 1023) - These numbers are reserved for services and applications. They are commonly used for applications such

Port number is assigned by IANA for protocol use, but may not be standardized, specified or widely used for such. Yes/No Port number may use the protocol conditionally only, or alternate its use (fallback if the other protocol fails). Port 22 Port number doesn't use the protocol, but may use the protocol on another specified port (e.g., port 22 Internet Assigned Numbers Authority (IANA) Founded: 1988; 32 years ago (): Founder: U.S. Federal Government: An Opte Project visualization of routing paths through a portion of the Internet IANA Allocation Guidelines for TCP and UDP Port Numbers draft-cotton-tsvwg-iana-ports-00 Status of this Memo. By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79.

Since Alt-Svc can point you to any port number, unless we have evidence that UDP port numbers are already highly ossified, I don't see an issue with not using 443 for most use-cases. We would want a default port associated with a new scheme ( #253 ), but we don't yet have that and that wouldn't be the common case regardless.

The Internet Assigned Numbers Authority (IANA) registers ports 1024 to 49151 for the convenience of the Internet community. Port numbers from 49152 to 65535 are private ports, also called "dynamic Nov 02, 2017 · The port number identifies what type of port it is. For example, port 80 is used for HTTP traffic. Some ports have numbers that are assigned to them by the IANA , and these are called the " well-known ports " which are specified in RFC 1700. Port number conservation is also improved by recommending that applications that do not require an assigned port should register only a service name without an associated port number. 8. IANA Procedures for Managing the Service Name and Transport Protocol Port Number Registry This section describes the process for handling requests associated These ports are assigned to specific server sevice by the Internet Assigned Numbers Authority (IANA). For example, port 80 is used by web servers. Port 1024 to 49151: These are ports that an organization, such as application developers, can register with IAMA to be used for a particular service. These should be treated as semi-reserved.