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 "ud"

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Port: 20/UDP
20/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • ftp-data
    File Transfer [Default Data]
    IANA
Port: 21/UDP
21/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • ftp
    File Transfer [Control]
    IANA
Port: 22/UDP
22/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • ssh
    The Secure Shell (SSH) Protocol
    IANA
  • threat
    [threat] pcAnywhere(Used in older versions, though newer version still use it for backwards compatibility.)
    Bekkoame
Port: 23/UDP
23/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • telnet
    Telnet
    IANA
  • telnet
    -
    SANS
  • telnet
    [threat] Telnet
    Bekkoame
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: 25/UDP
25/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • smtp
    Simple Mail Transfer
    IANA
Port: 26/UDP
26/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
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: 28/UDP
28/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  •  
    Unassigned
    IANA
Port: 29/UDP
29/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • msg-icp
    MSG ICP
    IANA
  •  
    MSG ICP (Official)
    WIKI
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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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