TCP/UDP Port Finder

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Database updated - March 30, 2016

Search results for "513"

Port: 513/TCP
513/TCP - Known port assignments (6 records found)
  • Service
    Details
    Source
  • login
    remote login a la telnet; automatic authentication performed based on priviledged port numbers and distributed data bases which identify "authentication domains"
    IANA
  •  
    rlogin (Official)
    WIKI
  • login
    BSD rlogind(8)
    SANS
  • threat
    [threat] Grlogin
    Bekkoame
  • grlogin
    [trojan] Grlogin
    SANS
  • 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: 513/UDP
513/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  •  
    Who (Official)
    WIKI
  • who
    maintains data bases showing who's logged in to machines on a local net and the load average of the machine
    Bekkoame
  • who
    BSD rwhod(8)
    SANS

About TCP/UDP ports

TCP port 513 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 513 in the same order in which they were sent. Guaranteed communication over TCP port 513 is the main difference between TCP and UDP. UDP port 513 would not have guaranteed communication as TCP.

UDP on port 513 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 513 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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