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 "sys"

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Port: 657/UDP
657/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • rmc
    RMC
    IANA
  •  
    IBM RMC (Remote monitoring and Control) protocol, used by System p5 AIX Integrated Virtualization Manager (IVM) and Hardware Management Console to connect managed logical partitions (LPAR) to enable dynamic partition reconfiguration (Official)
    WIKI
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 695/TCP
695/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • ieee-mms-ssl
    IEEE-MMS-SSL
    IANA
  •  
    IEEE-MMS-SSL (IEEE Media Management System over SSL) (Official)
    WIKI
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 742/TCP
742/TCP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • netrcs
    Network based Rev. Cont. Sys.
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 742/UDP
742/UDP - Known port assignments (2 records found)
  • Service
    Details
    Source
  • netrcs
    Network based Rev. Cont. Sys.
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 944/UDP
944/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Network File System (protocol) Service (Unofficial)
    WIKI
  •  
    Unassigned
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 953/TCP
953/TCP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Domain Name System (DNS) RNDC Service (Unofficial)
    WIKI
  •  
    Unassigned
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 953/UDP
953/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Domain Name System (DNS) RNDC Service (Unofficial)
    WIKI
  •  
    Unassigned
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 973/UDP
973/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Network File System (protocol) over IPv6 Service (Unofficial)
    WIKI
  •  
    Unassigned
    IANA
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
Port: 991/TCP
991/TCP - Known port assignments (4 records found)
  • Service
    Details
    Source
  • nas
    Netnews Administration System
    IANA
  •  
    NAS (Netnews Administration System) (Official)
    WIKI
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
  • trojan
    [trojan] Snape. Works on Windows. Aliases: Backdoor.Snape
    Simovits
Port: 991/UDP
991/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • nas
    Netnews Administration System
    IANA
  •  
    NAS (Netnews Administration System) (Official)
    WIKI
  • ipcserver
    Mac OS X RPC-based services. Used by NetInfo, for example.
    Apple
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About TCP/UDP ports

TCP port 657 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 657 in the same order in which they were sent. Guaranteed communication over TCP port 657 is the main difference between TCP and UDP. UDP port 657 would not have guaranteed communication as TCP.
UDP on port 657 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 657 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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