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 "but"

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Port: 20/TCP
20/TCP - Known port assignments (6 records found)
  • Service
    Details
    Source
  • ftp-data
    File Transfer [Default Data]
    IANA
  •  
    FTP - data transfer (Official)
    WIKI
  • ftp-data
    File Transport Protocol (FTP).
    Apple
  • threat
    [threat] Randex
    Bekkoame
  • sennaspyftpserver
    [trojan] Senna Spy FTP server
    SANS
  • trojan
    [trojan] Amanda. Remote Access / Keylogger / Steals passwords / ICQ trojan. Works on Windows 95 and 98, together with ICQ. Amanda installs under Windows NT, but is not able to run. Aliases: Backdoor.Amanda
    Simovits
Port: 23/TCP
23/TCP - Known port assignments (20 records found)
  • Service
    Details
    Source
  •  
    Telnet protocol - unencrypted text communications (Official)
    WIKI
  • telnet
    -
    SANS
  • telnet
    Telnet.
    Apple
  • telnet
    Telnet
    IANA
  • threat
    [threat] Tiny Telnet Server - TTS
    Bekkoame
  • threat
    [threat] Truva Atl
    Bekkoame
  • telnet
    [threat] Telnet
    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] Aphex's Remote Packet Sniffer. Remote Access / Network sniffer. Works on Windows. Aliases: Asniffer
    Simovits
  • trojan
    [trojan] AutoSpY. Anti-protection trojan / Remote Access / Worm / Network trojan / DoS tool / Telnet server / Virus dropper / Prank trojan. Works on Windows 95 and 98, together with MS Outlook. At least on version 1.2 Apocalipse, Telnet can be used as client. Aliases: AntiSpy, Backdoor.AntiSpy, Backdoor.AutoSpy
    Simovits
  • trojan
    [trojan] ButtMan. Remote Access. Works on Windows 95, 98 and NT. Aliases: BM, Backdoor.Buttman, Backdoor.Tubma, Backdoor.BR, Tubma
    Simovits
  • trojan
    [trojan] Fire HacKer. Remote Access. Works on Windows. Aliases: Backdoor.FireHacker
    Simovits
  • trojan
    [trojan] My Very Own trojan. Remote Access / FTP server. Works on Windows 95, 98 and ME. Telnet is used as client.
    Simovits
  • trojan
    [trojan] Pest. Remote Access / Keylogger / Steals passwords / Remote peeker / MSN trojan / Port scanner / Destructive trojan. Works on Windows 95, 98, ME, NT, 2000 and XP, together with MS MSN Messenger. the first version(s) did NOT work on Windows 2000. Aliases: Pestdoor, Backdoor.Pestdoor, Antilam, Backdoor.Antilam.g1, Juntador, TrojanDropper.Win32.Juntador.c
    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] Tiny Telnet Server - TTS. Remote Access. Works on Windows. Telnet server.
    Simovits
  • trojan
    [trojan] Truva Atl. Anti-protection trojan / Remote Access. Works on Windows 95 and 98. Aliases: Komut, Backdoor.Komut, Warhome, BKDR_Warhome
    Simovits
  • threat
    [threat] Dagonit
    Bekkoame
  • threat
    [threat] Fire HacKer
    Bekkoame
  • threat
    [threat] MindControl
    Bekkoame
Port: 28/TCP
28/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
  • altavista-fw97
    AltaVista Firewall97
    SANS
  • trojan
    [trojan] Amanda. Remote Access / Keylogger / Steals passwords / ICQ trojan. Works on Windows 95 and 98, together with ICQ. Amanda installs under Windows NT, but is not able to run. Aliases: Backdoor.Amanda
    Simovits
Port: 514/TCP
514/TCP - Known port assignments (7 records found)
  • Service
    Details
    Source
  • shell
    BSD rshd(8)
    SANS
  • shell
    shell.
    Apple
  •  
    Shell - used to execute non-interactive commands on a remote system (Remote Shell, rsh, remsh) (Official)
    WIKI
  • shell
    cmd like exec, but automatic authentication is performed as for login server
    IANA
  • rpcbackdoor
    [trojan] RPC Backdoor
    SANS
  • threat
    [threat] RPC Backdoor
    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
Port: 517/TCP
517/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • talk
    like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established)
    Bekkoame
  • talk
    like tenex link but across
    SANS
Port: 517/UDP
517/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Talk (Official)
    WIKI
  • talk
    like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established)
    Bekkoame
  • talk
    like tenex link but across
    SANS
Port: 1645/TCP
1645/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • sightline
    SightLine
    IANA
  •  
    radius auth, RADIUS authentication protocol (default for Cisco and Juniper Networks RADIUS servers, but see port 1812 below) (Unofficial)
    WIKI
  • datametrics
    datametrics
    SANS
  • threat
    [threat] Remote Authentication Dial In User Service (RADIUS) RADIUS, or Remote Authentication Dial-In User service, is a freely available distributed security system developed by Lucent Technologies InterNetworking Systems. Lucent has worked with the Internet Engineering Task Force (IETF) to define RADIUS as an interoperable method for distributed security on the Internet. RADIUS was designed based on a previous recommendation from the IETF's Network Access Server Working Requirements Group.
    Bekkoame
Port: 1645/UDP
1645/UDP - Known port assignments (5 records found)
  • Service
    Details
    Source
  • sightline
    SightLine
    IANA
  •  
    radius auth, RADIUS authentication protocol (default for Cisco and Juniper Networks RADIUS servers, but see port 1812 below) (Unofficial)
    WIKI
  • datametrics
    datametrics
    SANS
  • radius
    radius authentication
    SANS
  • threat
    [threat] Remote Authentication Dial In User Service (RADIUS) RADIUS, or Remote Authentication Dial-In User service, is a freely available distributed security system developed by Lucent Technologies InterNetworking Systems. Lucent has worked with the Internet Engineering Task Force (IETF) to define RADIUS as an interoperable method for distributed security on the Internet. RADIUS was designed based on a previous recommendation from the IETF's Network Access Server Working Requirements Group.
    Bekkoame
Port: 1646/TCP
1646/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • sa-msg-port
    sa-msg-port
    IANA
  •  
    radius acct, RADIUS authentication protocol (default for Cisco and Juniper Networks RADIUS servers, but see port 1813 below) (Unofficial)
    WIKI
Port: 1646/UDP
1646/UDP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • sa-msg-port
    sa-msg-port
    IANA
  •  
    radius acct, RADIUS authentication protocol (default for Cisco and Juniper Networks RADIUS servers, but see port 1813 below) (Official)
    WIKI
  • radacct
    radius accounting
    SANS
  • threat
    [threat] Remote Authentication Dial In User Service (RADIUS) RADIUS accounting consists of an accounting server and accounting clients (Lucent (formerly Livingston Enterprises)PortMaster products). RADIUS accounting starts automatically when the RADIUS server starts. On a UNIX host, the radiusd accounting daemon is a child process of the radiusd authentication daemon. The RADIUS accounting server uses the User Datagram Protocol (UDP), and listens for UDP packets at port 1646 by default.
    Bekkoame
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About TCP/UDP ports

TCP port 20 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 20 in the same order in which they were sent. Guaranteed communication over TCP port 20 is the main difference between TCP and UDP. UDP port 20 would not have guaranteed communication as TCP.
UDP on port 20 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 20 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.
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