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 "prot"

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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: 7/TCP
7/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • echo
    Echo
    IANA
  •  
    Echo Protocol (Official)
    WIKI
  • echo
    -
    SANS
  • echo
    echo.
    Apple
Port: 7/UDP
7/UDP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • echo
    Echo
    IANA
  •  
    Echo Protocol (Official)
    WIKI
  • echo
    -
    SANS
  • echo
    echo.
    Apple
Port: 9/TCP
9/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • discard
    Discard
    IANA
  •  
    Discard Protocol (Official)
    WIKI
Port: 9/UDP
9/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • discard
    Discard
    IANA
  •  
    Discard Protocol (Official)
    WIKI
Port: 13/TCP
13/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • daytime
    Daytime
    IANA
  •  
    Daytime Protocol (RFC 867) (Official)
    WIKI
  • daytime
    Daytime (RFC 867)
    Bekkoame
  • daytime
    -
    SANS
Port: 13/UDP
13/UDP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • daytime
    Daytime
    IANA
  •  
    Daytime Protocol (RFC 867) (Official)
    WIKI
  • daytime
    Daytime (RFC 867)
    Bekkoame
  • daytime
    -
    SANS
Port: 18/TCP
18/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • msp
    Message Send Protocol (historic)
    IANA
  •  
    Message Send Protocol (Official)
    WIKI
  • trojan
    [trojan] Skun. Remote Access / Destructive trojan. Works on Windows. Aliases: Backdoor.Skun
    Simovits
Port: 18/UDP
18/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • msp
    Message Send Protocol (historic)
    IANA
  •  
    Message Send Protocol (Official)
    WIKI
Port: 19/TCP
19/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • chargen
    Character Generator
    IANA
  •  
    Character Generator Protocol (CHARGEN) (Official)
    WIKI
  • trojan
    [trojan] Skun. Remote Access / Destructive trojan. Works on Windows. Aliases: Backdoor.Skun
    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.
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