tcp port 21,udp port 21,udp tcp 21 description,biggest ports library database

On this page you can find tools for search TCP Port Numbers and UDP Port Numbers.
Current service contain the biggest tcp udp port list. Port search going through 4 library (database),
total number of records are about 22000 (in 3 times more that in other service).
Library's:

IANA port numbers assignments library (database) - The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.
WIKI port numbers assignments library (database) - Good known wikipedia ports library
Gasmy library, Beta Library - good known manualy created port databases.

The closest known TCP ports before 21 port :20 ([trojan] Senna Spy FTP server), 20 (FTP - data), 20 (File Transfer [Default Data]), 20 (File Transfer [Default Data]), 20 (File Transfer Protocol (FTP) data transfer),
The closest known UDP ports before 21 port :20 (File Transfer [Default Data]), 20 (File Transfer [Default Data]), 20 (File Transfer Protocol (FTP) data transfer), 19 (ttytst source ), 19 (Character Generator Protocol (CHARGEN)),
The closest known TCP ports before 21 port :22 ( SSH Remote Login Protocol ), 22 (Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding), 22 (Secure Shell (SSH)-used for secure logins, file transfers (scp, sftp) and port forwarding), 22 (SSH Remote Login Protocol), 22 (The Secure Shell (SSH) Protocol),
The closest known UDP ports before 21 port :22 (PCAnywhere (deprecated)), 22 (Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding), 22 (Secure Shell (SSH)-used for secure logins, file transfers (scp, sftp) and port forwarding), 22 (SSH Remote Login Protocol), 22 (The Secure Shell (SSH) Protocol),
In computer networking, the protocols of the Transport Layer of the Internet Protocol Suite, most notably the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP),
use a numerical identifier for the data structures of the endpoints for host-to-host communications.
Such an endpoint is known as a port and the identifier is the port number.

The Transmission Control Protocol (TCP) is one of the core protocols of the Internet Protocol Suite. TCP is so central that the entire suite is often referred to as "TCP/IP." Whereas IP handles lower-level transmissions from computer to computer as a message makes its way across the Internet, TCP operates at a higher level, concerned only with the two end systems, for example a Web browser and a Web server. In particular, TCP provides reliable, ordered delivery of a stream of bytes from one program on one computer to another program on another computer. Besides the Web, other common applications of TCP include e-mail and file transfer. Among its management tasks, TCP controls message size, the rate at which messages are exchanged, and network traffic congestion.
The User Datagram Protocol (UDP) is one of the core members of the Internet Protocol Suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, sometimes known as datagrams, to other hosts on an Internet Protocol (IP) network without requiring prior communications to set up special transmission channels or data paths. UDP is sometimes called the Universal Datagram Protocol. The protocol was designed by David P. Reed in 1980 and formally defined in RFC 768.