TCP/UDP Port Finder

Enter port number (e.g. 21), service (e.g. ssh, ftp) or threat (e.g. nimda)
Database updated - March 30, 2016

Search results for "all"

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Port: 21/TCP
21/TCP - Known port assignments (46 records found)
  • Service
    Details
    Source
  • ftp
    FTP control.
    Apple
  •  
    FTP - control (command) (Official)
    WIKI
  • ftp
    File Transfer [Control]
    IANA
  • threat
    [threat] Cattivik FTP Server
    Bekkoame
  • threat
    [threat] CC Invader
    Bekkoame
  • threat
    [threat] Dark FTP
    Bekkoame
  • threat
    [threat] Doly Trojan
    Bekkoame
  • threat
    [threat] Fore
    Bekkoame
  • threat
    [threat] Invisible FTP
    Bekkoame
  • threat
    [threat] Juggernaut 42
    Bekkoame
  • threat
    [threat] Larva
    Bekkoame
  • threat
    [threat] MotIv FTP
    Bekkoame
  • threat
    [threat] Net Administrator
    Bekkoame
  • threat
    [threat] Ramen
    Bekkoame
  • threat
    [threat] Senna Spy FTP server
    Bekkoame
  • threat
    [threat] The Flu
    Bekkoame
  • threat
    [threat] Traitor 21
    Bekkoame
  • threat
    [threat] W32.Bobax
    Bekkoame
  • threat
    [threat] W32.Loxbot
    Bekkoame
  • threat
    [threat] W32.Mytob
    Bekkoame
  • threat
    [threat] WebEx
    Bekkoame
  • threat
    [threat] WinCrash
    Bekkoame
  • trojan
    [trojan] ADM worm. Worm / Rootkit / Backdoor. Works on Unix (Linux). Affects Linux RedHat 4.0 to 5.2. Aliases: ADM Inet w0rm, Linux.ADM.Worm
    Simovits
  • trojan
    [trojan] Back Construction. Remote Access / FTP server. Works on Windows 95 and 98. Aliases: Nightmare.B, Backdoor.Nightmare.B
    Simovits
  • trojan
    [trojan] Blade Runner. Remote Access. Works on Windows 95 and 98. The Client.zip-file also includes 32 WAV-files and 6 BMP-files. Aliases: Backdoor.BladeRunner
    Simovits
  • trojan
    [trojan] BlueFire. Remote Access / FTP server / Telnet trojan. Works on Windows. Aliases: Backdoor.BlueFire
    Simovits
  • trojan
    [trojan] Bmail. Remote Access. Works on Windows. Aliases: BackDoor.ABH, Backdoor.FTP.Bmail
    Simovits
  • trojan
    [trojan] Cattivik FTP Server. FTP server. Works on Windows 95, 98 and ME. Aliases: Senza, Backdoor.Senza
    Simovits
  • trojan
    [trojan] CC Invader. Remote Access / FTP server. Works on Windows 95, 98 and ME. Aliases: Backdoor.CCInvader, Backdoor.SysReg, SysReg
    Simovits
  • trojan
    [trojan] Dark FTP. Anti-protection trojan / Remote Access / FTP server / IRC trojan / Hacking tool. Works on Windows 95, 98, ME and NT, together with an IRC software and any FTP software. Aliases: Backdoor.KE
    Simovits
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
  • trojan
    [trojan] FreddyK. Anti-protection trojan / Remote Access / FTP server / Downloading trojan. Works on Windows 95, 98 and ME. Aliases: Freddy 2001, Backdoor.FreddyK, TrojanDropper.Win32.Joiner.w
    Simovits
  • trojan
    [trojan] Invisible FTP. Downloading trojan / FTP server. Works on Windows 95, 98, ME, NT and 2000. Uses any FTP client as client, such as Cute FTP and Ws_ftp. Aliases: Win FTP, Zemac FTP, Backdoor.InvisibleFTP
    Simovits
  • trojan
    [trojan] KWM. Remote Access / Keylogger / Steals passwords / Downloading trojan. Works on Windows. Aliases: Backdoor.KWM
    Simovits
  • trojan
    [trojan] MscanWorm.
    Simovits
  • trojan
    [trojan] NerTe. Remote Access / Keylogger / Steals passwords. Works on Windows 95, 98, ME, NT and 2000. Aliases: Backdoor.NerTe, Backdoor.SG
    Simovits
  • trojan
    [trojan] NokNok. Anti-protection trojan / Remote Access / Steals passwords / IRC trojan / Port scanner. Works on Windows 95, 98, ME and 2000. Does NOT work on Windows NT. Aliases: Backdoor.FA, Troj_BckNokNok
    Simovits
  • trojan
    [trojan] Pinochet. Remote Access / Keylogger. Works on Windows.
    Simovits
  • trojan
    [trojan] Ramen. Worm / HTML trojan / HTTP server / Hacking tool / Destructive trojan. Works on Unix (Linux). Linux Red Hat 6.x and early versions of 7.0. May also work on other Unix dialects such as FreeBSD and Linux SuSE, Mandrake and Cladera. The mail addresses used are [email protected] and [email protected] Aliases: Linux.Ramen, Worm.Ramen, Elf.Ramen
    Simovits
  • trojan
    [trojan] Reverse Trojan. Remote Access / Keylogger / IRC trojan / FTP server / LAN trojan. Works on Windows. Aliases: Backdoor.ReverseTrojan
    Simovits
  • trojan
    [trojan] RTB 666. Remote Access / FTP server / IP scanner. Works on Windows, together with MS Internet Explorer. Aliases: Backdoor.RTB
    Simovits
  • trojan
    [trojan] The Flu. FTP server. Works on Windows 95, 98 and ME. Any FTP client can be used. Aliases: Rux the Flu, Backdoor.TheFlu
    Simovits
  • trojan
    [trojan] WinCrash. Anti-protection trojan / Remote Access / Keylogger / Steals passwords / Network trojan / IP scanner. Works on Windows 95, 98, ME and NT. Aliases: BackDoor.M, Backdoor.Wincrash, W95/Backdoor.WinCrash
    Simovits
  • trojan
    [trojan] Voyager Alpha Force. Worm / Remote Access / Distributed DoS tool / SQL trojan / IRC trojan / Downloading trojan / FTP server. Works on Windows, together with MS SQL Server 6.5 and 7.0. Aliases: MS SQL worm, SQL worm, Cblade, W32.Cblade.Worm
    Simovits
  • threat
    [threat] Back Construction
    Bekkoame
  • threat
    [threat] Blade Runner
    Bekkoame
Port: 41/TCP
41/TCP - Known port assignments (8 records found)
  • Service
    Details
    Source
  • graphics
    -
    SANS
  • graphics
    Graphics
    IANA
  • threat
    [threat] RAT: Deep Throat Puts an FTP service at port 41 (TCP).
    Bekkoame
  • deepthroat
    [trojan] DeepThroat
    SANS
  • foreplay
    [trojan] Foreplay
    SANS
  • trojan
    [trojan] Deep Throat. Remote Access / FTP server / Steals passwords. Works on Windows 95, 98 and NT. There is a Global Master Password backdoor in all the servers: v 2.0 - whothefuckdoyouthinkiamgoddamnit2v 2.1 - whothefuckdoyouthinkiamgoddamnit1v 3.* - whothefuckdoyouthinkiamgoddamnit3 Aliases: Win32.DeepThroat, DTV2, DTV3, BackDoor.J, Backdoor.DeepThroat, W95/Backdoor.Tray
    Simovits
  • trojan
    [trojan] Foreplay. Remote Access / FTP server. Works on Windows. Aliases: F0replay, WiNNUke eXtreame, Reduced Foreplay
    Simovits
  • threat
    [threat] Foreplay
    Bekkoame
Port: 80/TCP
80/TCP - Known port assignments (78 records found)
  • Service
    Details
    Source
  •  
    Hypertext Transfer Protocol (HTTP) (Official)
    WIKI
  • http
    World Wide Web HTTP
    Bekkoame
  • http
    Hypertext Transfer Protocol (HTTP). World Wide Web, MobileMe, QuickTime Installer, iTunes Store and Radio, Software Update, RAID Admin, Backup, iCal calendar publishing, iWeb, WebDAV (iDisk), Final Cut Server, AirPlay, OS X Lion Internet Restore, Profile Manager.
    Apple
  • www-http
    World Wide Web HTTP
    IANA
  • threat
    [threat] Back Orifice 2k Plug-Ins
    Bekkoame
  • threat
    [threat] Banito
    Bekkoame
  • threat
    [threat] Bebshell
    Bekkoame
  • threat
    [threat] Cafeini
    Bekkoame
  • threat
    [threat] CGI Backdoor
    Bekkoame
  • threat
    [threat] Civcat
    Bekkoame
  • threat
    [threat] Eaghouse
    Bekkoame
  • threat
    [threat] Executor
    Bekkoame
  • threat
    [threat] God Message
    Bekkoame
  • threat
    [threat] God Message Creator
    Bekkoame
  • threat
    [threat] Hesive
    Bekkoame
  • threat
    [threat] Hexem
    Bekkoame
  • threat
    [threat] Hooker
    Bekkoame
  • threat
    [threat] IISworm
    Bekkoame
  • threat
    [threat] Ketch
    Bekkoame
  • threat
    [threat] Lodear
    Bekkoame
  • threat
    [threat] Mindos
    Bekkoame
  • threat
    [threat] MTX
    Bekkoame
  • threat
    [threat] Muquest
    Bekkoame
  • threat
    [threat] Mydoom
    Bekkoame
  • threat
    [threat] NCX
    Bekkoame
  • threat
    [threat] Reverse WWW Tunnel Backdoor
    Bekkoame
  • threat
    [threat] RingZero
    Bekkoame
  • threat
    [threat] Seeker
    Bekkoame
  • threat
    [threat] Tabela
    Bekkoame
  • threat
    [threat] W32.Beagle
    Bekkoame
  • threat
    [threat] W32.Bobax
    Bekkoame
  • threat
    [threat] W32.Gaobot
    Bekkoame
  • threat
    [threat] W32.HLLW.Doomjuice
    Bekkoame
  • threat
    [threat] W32.HLLW.Heycheck
    Bekkoame
  • threat
    [threat] W32.HLLW.Polybot
    Bekkoame
  • threat
    [threat] W32.Ifbo
    Bekkoame
  • threat
    [threat] W32.Pinkton
    Bekkoame
  • threat
    [threat] W32.Spybot
    Bekkoame
  • threat
    [threat] W32.Tdiserv
    Bekkoame
  • threat
    [threat] W32.Theals
    Bekkoame
  • threat
    [threat] W32.Welchia
    Bekkoame
  • threat
    [threat] W32.Yaha
    Bekkoame
  • threat
    [threat] WAN Remote
    Bekkoame
  • threat
    [threat] Web Server CT
    Bekkoame
  • threat
    [threat] WebDownloader
    Bekkoame
  • threat
    [threat] Xeory
    Bekkoame
  • threat
    [threat] Zombam
    Bekkoame
  • trojan
    [trojan] 711 trojan (Seven Eleven). Anti-protection trojan / Remote Access / Keylogger / Steals passwords / Hacking tool / Destructive trojan. Works on Windows 95, 98 and ME. The source code is mainly based on the one of SoftWAR. Aliases: Seven Eleven, Seven1one
    Simovits
  • trojan
    [trojan] AckCmd. Remote Access / Tunneling software. Works on Windows 2000 and XP.
    Simovits
  • trojan
    [trojan] BlueFire. Remote Access / FTP server / Telnet trojan. Works on Windows. Aliases: Backdoor.BlueFire
    Simovits
  • trojan
    [trojan] Cafeini. Anti-protection trojan / Remote Access / Steals passwords / Hacking tool. Works on Windows 95, 98, NT and 2000. Telnet can also be used as client. Aliases: TROJ_CAFEIN
    Simovits
  • trojan
    [trojan] Duddie. Remote Access / Keylogger / Destructive trojan. Works on Windows. Aliases: Backdoor.Duddie
    Simovits
  • trojan
    [trojan] Executor. Remote Access / Virus dropper. Works on Windows 95 and 98. Aliases: Win32.Executor trojan, Executer, Executor Controller, Backdoor.Excecutor.b, Seek
    Simovits
  • trojan
    [trojan] God Message. Virus / Remote Access / ActiveX trojan / Downloading trojan / Worm / Mail trojan / IRC trojan / Network trojan. Works on Windows 95, 98, ME, NT and 2000, together with MS Internet Explorer 5, MS Outlook and mIRC. Aliases: BackDoor.AB.gen (?), JS.Trojan.WindowBomb
    Simovits
  • trojan
    [trojan] Intruzzo. Remote Access / Steals passwords / Port scanner. Works on Windows 98, ME, NT and 2000. Aliases: BackDoor.ADM, Backdoor.Intruzzo, Backdoor.Intrzo, Unknown Guy, Renomb, Backdoor.Renomb
    Simovits
  • trojan
    [trojan] Latinus. Remote Access / Keylogger / Steals passwords. Works on Windows 95, 98, ME, NT, 2000 and XP. Aliases: Backdoor.Latinus, Trojan.Dropper.Latinus, Backdoor.KF, InvasionCrash, PestDoor, BackDoor.AHS, Backdoor.Pestdoor
    Simovits
  • trojan
    [trojan] Lithium. Remote Access / Steals passwords / Network trojan / Downloading trojan. Works on Windows 95, 98, ME, 2000 and XP. Does NOT work on Windows NT. Aliases: Backdoor.Lithium, BackDoor.YQ
    Simovits
  • trojan
    [trojan] MscanWorm.
    Simovits
  • trojan
    [trojan] NerTe. Remote Access / Keylogger / Steals passwords. Works on Windows 95, 98, ME, NT and 2000. Aliases: Backdoor.NerTe, Backdoor.SG
    Simovits
  • trojan
    [trojan] Nimda. Virus / Worm / Mail trojan / Network trojan / Hacking tool. Works on Windows 95, 98, ME, NT, 2000 and XP, together with MS Internet Information Server (IIS), MS Internet Explorer 5.5 SP1, MS Outlook , MS Outlook Express and MS Word. Aliases: Concept Virus (CV) v.5, W32.Nimda, Minda, W32.Minda, I-Worm.Nimda, Code Rainbow , PE_Nimda.A, CV-5
    Simovits
  • trojan
    [trojan] Noob. Downloading trojan / IRC trojan / ActiveX trojan / Hacking tool / Sniffer. Works on Windows 95, 98, ME, NT and 2000, together with MS Internet Explorer 4.0 SP1, 5.0 and 5.5, and mIRC. Aliases: VBS.Trojan.Noob, IRC.Noob
    Simovits
  • trojan
    [trojan] Optix Lite. Anti-protection trojan / Remote Access / Keylogger / SMTP server / Downloading trojan / Destructive trojan. Works on Windows 95, 98, ME, NT, 2000 and XP. Aliases: Backdoor.Optix, Troj_Optix, Backdoor.RS, BDS.Optix, Win32.Optix, Backdoor.AHE
    Simovits
  • trojan
    [trojan] Optix Pro. Anti-protection trojan / Remote Access / Keylogger / Steals passwords / FTP server. Works on Windows 95, 98, ME, NT, 2000 and XP, together with IRC, ICQ and AOL software. Aliases: Backdoor.OptixPro, BackDoor.ACH
    Simovits
  • trojan
    [trojan] Power. Worm / IRC trojan / Distributed DoS tool / Port proxy / IP Scanner. Works on Windows NT and 2000, together with MS Internet Information Server and Mirc32.
    Simovits
  • trojan
    [trojan] Ramen. Worm / HTML trojan / HTTP server / Hacking tool / Destructive trojan. Works on Unix (Linux). Linux Red Hat 6.x and early versions of 7.0. May also work on other Unix dialects such as FreeBSD and Linux SuSE, Mandrake and Cladera. The mail addresses used are [email protected] and [email protected] Aliases: Linux.Ramen, Worm.Ramen, Elf.Ramen
    Simovits
  • trojan
    [trojan] Remote Shell. Virus / Remote Access / Backdoor / Port sniffer. Works on Unix (Linux). The code may work on all other Unix dialects as well as all Windows platforms. Aliases: RST
    Simovits
  • trojan
    [trojan] Reverse WWW Tunnel Backdoor. Remote Access / Tunneling software. Works on UNIX (Linux, Solaris, AIX and OpenBSD).
    Simovits
  • trojan
    [trojan] RingZero. Works on Windows 95 and 98. It does not work under Windows NT. Aliases: Ring0, Trojan.PSW.Ring, RingZero.gen, Ring
    Simovits
  • trojan
    [trojan] RTB 666. Remote Access / FTP server / IP scanner. Works on Windows, together with MS Internet Explorer. Aliases: Backdoor.RTB
    Simovits
  • trojan
    [trojan] Scalper. Remote Access / Worm / Mail trojan / DoS tool / IP sacanner. Works on Unix (FreeBSD), together with Apache Webserver. Aliases: FreeBSD.Scalper.Worm, Elf_Scalper, APC, BSD/Scalper.worm, APworm, Ehcapa.worm, Linux/Ehcapa.worm
    Simovits
  • trojan
    [trojan] Screen Cutter. Works on Windows. Aliases: Screencut, Backdoor.Screencut
    Simovits
  • trojan
    [trojan] Seeker. JavaScript trojan. Works on Windows 95 and 98, together with MS Internet Explorer and Netscape Navigator. Aliases: SEEKER.B, JS.Trojan.Seeker.b, JetHome, Troj/JetHome, JS_SEEKER.B, JS/Seeker.B, JS/Seeker.gen
    Simovits
  • trojan
    [trojan] Slapper. Backdoor / Worm / IRC trojan / Proxy / Distributed DoS tool. Works on Unix (Linux - SuSe, Mandrake, RedHat, Slackware, Debian, Gentoo), together with Apache Web server. Aliases: Linux.Slapper.Worm, Apache/mod_ssl Worm, PUD, ELF/Slapper
    Simovits
  • trojan
    [trojan] Web Server CT. Remote Access / HTTP server. Works on Windows 95, 98, ME, NT and 2000. Aliases: Web Serve, CT2
    Simovits
  • trojan
    [trojan] WebDownloader. Remote Access / Downloading trojan. Works on Windows 95, 98 and ME. Aliases: Web Dl, FC Webdownloader, WebDL2k, Web Download, Backdoor.WebDL, WDL, WebDL3
    Simovits
  • threat
    [threat] 711 trojan (Seven Eleven)
    Bekkoame
  • threat
    [threat] AckCmd
    Bekkoame
  • threat
    [threat] Back End
    Bekkoame
Port: 106/TCP
106/TCP - Known port assignments (5 records found)
  • Service
    Details
    Source
  • 3com-tsmux
    3COM-TSMUX
    IANA
  • pop3pw
    Eudora compatible PW changer
    SANS
  • 3com-tsmux
    Password Server. Mac OS X Server Password Server
    Apple
  • 3com-tsmux
    (Unregistered Use).
    Apple
  • poppassd(epass)
    [threat] allows passwords to be changed on POP servers. Traditionally, users would have to have shell (Telnet) accounts on the servers in order to change their passwords. This allows users with just POP access to change their passwords.
    Bekkoame
Port: 999/TCP
999/TCP - Known port assignments (9 records found)
  • Service
    Details
    Source
  •  
    ScimoreDB Database System (Unofficial)
    WIKI
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • puprouter
    -
    IANA
  • garcon
    -
    Bekkoame
  • trojan
    [trojan] Deep Throat. Remote Access / FTP server / Steals passwords. Works on Windows 95, 98 and NT. There is a Global Master Password backdoor in all the servers: v 2.0 - whothefuckdoyouthinkiamgoddamnit2v 2.1 - whothefuckdoyouthinkiamgoddamnit1v 3.* - whothefuckdoyouthinkiamgoddamnit3 Aliases: Win32.DeepThroat, DTV2, DTV3, BackDoor.J, Backdoor.DeepThroat, W95/Backdoor.Tray
    Simovits
  • trojan
    [trojan] Foreplay. Remote Access / FTP server. Works on Windows. Aliases: F0replay, WiNNUke eXtreame, Reduced Foreplay
    Simovits
  • threat
    [threat] WinSatan
    Bekkoame
  • threat
    [threat] Foreplay
    Bekkoame
  • threat
    [threat] RAT: Deep Throat Puts a keylogger at port 999 (TCP). This will record all of a user's keystrokes.
    Bekkoame
Port: 1010/TCP
1010/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • surf
    surf
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • threat
    [threat] Doly Trojan
    Bekkoame
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
Port: 1011/TCP
1011/TCP - Known port assignments (5 records found)
  • Service
    Details
    Source
  •  
    Reserved
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • threat
    [threat] Augudor
    Bekkoame
  • threat
    [threat] Doly Trojan
    Bekkoame
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
Port: 1012/TCP
1012/TCP - Known port assignments (5 records found)
  • Service
    Details
    Source
  •  
    Reserved
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • threat
    [threat] Backdoor.Urat
    Bekkoame
  • threat
    [threat] Doly Trojan
    Bekkoame
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
Port: 1015/TCP
1015/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  •  
    Reserved
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • threat
    [threat] Doly Trojan
    Bekkoame
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
Port: 1016/TCP
1016/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  •  
    Reserved
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • threat
    [threat] Doly Trojan
    Bekkoame
  • trojan
    [trojan] Doly Trojan. Remote Access / Keylogger / IRC trojan. Works on Windows 95, 98 and NT. Please note that not all versions work on NT. Dhacker.exe is a Doly 1.6 password cracker and Vbrun60.exe is only needed if you want to run it (written in Visual Basic 6). Aliases: Backdoor.AZ, Backdoor.Doly
    Simovits
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About TCP/UDP ports

TCP port 21 uses the Transmission Control Protocol. TCP is one of the main protocols in TCP/IP networks. TCP is a connection-oriented protocol, it requires handshaking to set up end-to-end communications. Only when a connection is set up user's data can be sent bi-directionally over the connection.
Attention! TCP guarantees delivery of data packets on port 21 in the same order in which they were sent. Guaranteed communication over TCP port 21 is the main difference between TCP and UDP. UDP port 21 would not have guaranteed communication as TCP.
UDP on port 21 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 21 thinks that error checking and correction is not necessary or performed in the application, avoiding the overhead of such processing at the network interface level.
UDP (User Datagram Protocol) is a minimal message-oriented Transport Layer protocol (protocol is documented in IETF RFC 768).
Application examples that often use UDP: voice over IP (VoIP), streaming media and real-time multiplayer games. Many web applications use UDP, e.g. the Domain Name System (DNS), the Routing Information Protocol (RIP), the Dynamic Host Configuration Protocol (DHCP), the Simple Network Management Protocol (SNMP).
TCP vs UDP - TCP: reliable, ordered, heavyweight, streaming; UDP - unreliable, not ordered, lightweight, datagrams.
Your IP address
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