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.
 
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.