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Port 21

Port
Protocol
Service Name
Description
Source
21
TCP UDP
ftp
File Transfer [Control]
IANA
21
SCTP 
ftp
FTP
IANA
21
TCP 
FTP control (command),Official
wikipedia
21
TCP 
FTP control
Apple.com
21
TCP 
Back Construction, Blade Runner, Doly Trojan, Fore, 7tp trojan, Invisible FTP, Larva, MBT, Motiv, Net Administrator, Senna Spy FTP Server, Traitor, WebEx, WinCrash
emsisoft
21
TCP 
Back Construction, Blade Runner, Cattivik FTP Server, CC Invader, Dark FTP, Doly Trojan, Freddy beta 2 - beta 3, Fore, Invisible FTP, Juggernaut 42, Larva, MotIv FTP, Net Administrator, Ramen, Senna Spy FTP server, The Flu, Traitor 21, WebEx, WinCrash
anti-trojan
21
 
Back Construction, Blade Runner, Doly Trojan, Fore, Invisible FTP, Juggernaut 42 , Larva, MotIv FTP, Net Administrator, Senna Spy FTP server, Traitor 21,WebEx, WinCrash
sans.org
21
 
ADM worm, Back Construction, Blade Runner, BlueFire, Bmail, Cattivik FTP Server, CC Invader, Dark FTP, Doly Trojan, FreddyK, Invisible FTP, KWM,MscanWorm, NerTe, NokNok, Pinochet, Ramen, Reverse Trojan, RTB 666, The Flu, WinCrash, Voyager Alpha Force
simovits.com
21
TCP 
WinCrash
bekkoame
21
TCP 
Ramen
bekkoame
21
TCP 
Senna Spy FTP server
bekkoame
21
TCP 
The Flu
bekkoame
21
TCP 
Traitor 21
bekkoame
21
TCP 
W32.Bobax
bekkoame
21
TCP 
W32.Loxbot
bekkoame
21
TCP 
W32.Mytob
bekkoame
21
TCP UDP
ftp
File Transfer [Control]
bekkoame
21
TCP 
Net Administrator
bekkoame
21
TCP 
WebEx
bekkoame
21
TCP 
CC Invader
bekkoame
21
TCP 
MotIv FTP
bekkoame
21
TCP 
Back Construction
bekkoame
21
TCP 
Blade Runner
bekkoame
21
TCP 
Cattivik FTP Server
bekkoame
21
TCP 
Dark FTP
bekkoame
21
TCP 
Doly Trojan
bekkoame
21
TCP 
Fore
bekkoame
21
TCP 
Invisible FTP
bekkoame
21
TCP 
Juggernaut 42
bekkoame
21
TCP 
Larva
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);