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Port 20

Port
Protocol
Service Name
Description
Source
20
TCP UDP
ftp-data
File Transfer [Default Data]
IANA
20
SCTP 
ftp-data
FTP
IANA
20
TCP UDP
FTP data transfer,Official
wikipedia
20
TCP 
File Transport Protocol (FTP)
Apple.com
20
TCP 
Senna Spy FTP server
anti-trojan
20
 
Senna Spy FTP server
sans.org
20
 
Amanda
simovits.com
20
TCP 
Randex
bekkoame
20
TCP UDP
ftp-data
File Transfer [Default Data]
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);