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Port 21 Details
known port assignments
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 21 |
tcp |
FTP |
File Transfer Protocol.
List of some trojan horses/backdoors that also use this port: Back Construction, Blade Runner, Cattivik FTP Server, CC Invader, Dark FTP, Doly Trojan, Fore, Invisible FTP, Juggernaut 42, Larva, MotIv FTP, Nerte 7.8.1, Net Administrator, Ramen, Senna Spy FTP server, The Flu, Traitor 21, WebEx, WinCrash, W32.Mytob.AE@mm, W32.Sober.N@mm.
W32.Bobax.AF@mm (08.16.2005) - a mass-mailing worm that opens a backdoor and lowers security settings on the compromised computer. It exploits the MS Plug and Play Buffer Overflow vulnerability (MS Security Bulletin MS05-039) on port 21/tcp., and by sending copies of itself to gathered email addresses. Also opens a backdoor on a random tcp port and/or port 80/udp.
W32.Loxbot.C (01.11.2006) |
SG |
| 21 |
udp |
FSP |
FSP/FTP |
SG |
| 21 |
tcp |
|
FTP - control (command) (official) |
Wikipedia |
| 21 |
tcp |
trojan |
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 |
Trojans |
| 21 |
tcp,udp |
ftp |
File Transfer [Control] [RFC4960] |
IANA |
| 21 |
tcp,udp |
ftp |
File Transfer [Control] |
SANS |
| 21 |
tcp |
applications |
GeoVision DMIP |
Portforward |
| 21,80,3389,4550,5550,6550,9650 |
tcp |
applications |
GeoVision TwinDVR with Webcam |
Portforward |
| 21,80,3389,4550,5550,6550 |
tcp |
applications |
GeoVision Webcam |
Portforward |
| 21,50000-50004 |
tcp |
applications |
Serv-U |
Portforward |
| 21,1983 |
tcp |
applications |
Tales of Pirates |
Portforward |
| 20,21 |
tcp |
applications |
vsftp |
Portforward |
| 21 |
tcp,udp |
ftp |
File Transfer [Control] |
Nmap |
| 21 |
tcp |
BackConstruction |
[trojan] Back Construction |
Neophasis |
| 21 |
tcp |
BladeRunner |
[trojan] BladeRunner |
Neophasis |
| 21 |
tcp |
CattivikFTPServer |
[trojan] Cattivik FTP Server |
Neophasis |
| 21 |
tcp |
CCInvader |
[trojan] CC Invader |
Neophasis |
| 21 |
tcp |
DarkFTP |
[trojan] Dark FTP |
Neophasis |
| 21 |
tcp |
DolyTrojan |
[trojan] Doly Trojan |
Neophasis |
| 21 |
tcp |
Fore |
[trojan] Fore |
Neophasis |
| 21 |
tcp |
FreddyK |
[trojan] FreddyK |
Neophasis |
| 21 |
tcp |
InvisibleFTP |
[trojan] Invisible FTP |
Neophasis |
| 21 |
tcp |
Juggernaut42 |
[trojan] Juggernaut 42 |
Neophasis |
| 21 |
tcp |
Larva |
[trojan] Larva |
Neophasis |
| 21 |
tcp |
MotIvFTP |
[trojan] MotIv FTP |
Neophasis |
| 21 |
tcp |
NetAdministrator |
[trojan] Net Administrator |
Neophasis |
| 21 |
tcp |
Ramen |
[trojan] Ramen |
Neophasis |
| 21 |
tcp |
RTB666 |
[trojan] RTB 666 |
Neophasis |
| 21 |
tcp |
SennaSpyFTPserver |
[trojan] Senna Spy FTP server |
Neophasis |
| 21 |
tcp |
Traitor21 |
[trojan] Traitor 21 |
Neophasis |
| 21 |
tcp |
[trojan]TheFlu |
[trojan] The Flu |
Neophasis |
| 21 |
tcp |
WebEx |
[trojan] WebEx |
Neophasis |
| 21 |
tcp |
WinCrash |
[trojan] WinCrash |
Neophasis |
| 21 |
tcp |
AudioGalaxy |
AudioGalaxy file sharing app |
Neophasis |
34 records found
« back to SG Ports
External Resources
SANS Internet Storm Center: port 21
tantalo.net port assignments: port 21
GRC: port 21
Notes:
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol. TCP is one of the main protocols in
TCP/IP networks. Whereas the IP protocol deals only with packets, TCP enables two hosts
to establish a connection and exchange streams of data. TCP guarantees delivery of data
and that packets will be delivered in the same order in which they were sent.
Guaranteed communication is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol, a communications protocol for the Internet network,
transport, and session layers. Like TCP (Transmission Control Protocol),
UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams
from one computer to applications on another computer, but unlike TCP, UDP is connectionless
and does not guarantee reliable communication; it's up to the application that received
the message to process any errors and verify correct delivery.
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