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 "system"

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Port: 4/TCP
4/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
  • threat
    [threat] Midnight Commander Sometimes this program is assigned to this prot
    Bekkoame
  • threat
    [threat] Self-Certifying File System(SFS) sfssd acceps connections on TCP port 4 and passes them to the appropriate SFS daemon. SFS is a secure, global file system with completely decentralized control. SFS uses NFS 3 as the underlying protocol for file access.
    Bekkoame
Port: 24/TCP
24/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  •  
    any private mail system
    IANA
  •  
    Priv-mail : any private mail system. (Official)
    WIKI
  • priv-mail
    any private mail system
    SANS
  • bo2kcontrolport
    [trojan] Back Orifice 2000 (BO2K) Control Port
    SANS
Port: 24/UDP
24/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    any private mail system
    IANA
  •  
    Priv-mail : any private mail system. (Official)
    WIKI
  • priv-mail
    any private mail system
    SANS
Port: 27/TCP
27/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • nsw-fe
    NSW User System FE
    IANA
  •  
    NSW User System FE (Official)
    WIKI
  • altavista-fw97
    AltaVista Firewall97
    SANS
  • trojan
    [trojan] Assasin. Anti-protection trojan / Remote Access / Keylogger / LAN trojan. Works on Windows 95, 98, ME, NT, 2000 and XP. Aliases: A.s.s.A'sin', Backdoor.Assasin, BackDoor.AGS
    Simovits
Port: 27/UDP
27/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • nsw-fe
    NSW User System FE
    IANA
  •  
    NSW User System FE (Official)
    WIKI
Port: 52/TCP
52/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • xns-time
    XNS Time Protocol
    IANA
  •  
    XNS (Xerox Network Systems) Time Protocol (Official)
    WIKI
  • trojan
    [trojan] MuSka52. Remote Access / Keylogger / Steals passwords / ICQ trojan / AIM trojan. Works on Windows, together with AOL's Messanger AIM. Aliases: Backdoor.QT, BackDoor.Muska, M52
    Simovits
  • trojan
    [trojan] Skun. Remote Access / Destructive trojan. Works on Windows. Aliases: Backdoor.Skun
    Simovits
Port: 52/UDP
52/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • xns-time
    XNS Time Protocol
    IANA
  •  
    XNS (Xerox Network Systems) Time Protocol (Official)
    WIKI
Port: 53/TCP
53/TCP - Known port assignments (11 records found)
  • Service
    Details
    Source
  • domain
    Domain Name System (DNS). MacDNS, FaceTime
    Apple
  •  
    Domain Name System (DNS) (Official)
    WIKI
  • domain
    Domain Name Server
    IANA
  • threat
    [threat] W32.Dasher
    Bekkoame
  • threat
    [threat] W32.Spybot
    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] li0n. Worm / Steals passwords / Rootkit dropper / Hacking tool / Distributed DoS tool. Works on Unix (Linux), together with BIND 8.2. Aliases: The Lion worm, Linux/Lion, 1i0n, Lion
    Simovits
  • trojan
    [trojan] MscanWorm.
    Simovits
  • trojan
    [trojan] MuSka52. Remote Access / Keylogger / Steals passwords / ICQ trojan / AIM trojan. Works on Windows, together with AOL's Messanger AIM. Aliases: Backdoor.QT, BackDoor.Muska, M52
    Simovits
  • threat
    [threat] Civcat
    Bekkoame
  • threat
    [threat] Esteems
    Bekkoame
Port: 53/UDP
53/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • domain
    Domain Name Server
    IANA
  •  
    Domain Name System (DNS) (Official)
    WIKI
  • domain
    Domain Name System (DNS). MacDNS, FaceTime
    Apple
Port: 54/TCP
54/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • xns-ch
    XNS Clearinghouse
    IANA
  •  
    XNS (Xerox Network Systems) Clearinghouse (Official)
    WIKI
  • trojan
    [trojan] MuSka52. Remote Access / Keylogger / Steals passwords / ICQ trojan / AIM trojan. Works on Windows, together with AOL's Messanger AIM. Aliases: Backdoor.QT, BackDoor.Muska, M52
    Simovits
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About TCP/UDP ports

TCP port 4 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 4 in the same order in which they were sent. Guaranteed communication over TCP port 4 is the main difference between TCP and UDP. UDP port 4 would not have guaranteed communication as TCP.
UDP on port 4 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 4 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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