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 "520"

Port: 520/TCP
520/TCP - Known port assignments (2 records found)
  • Service
  • efs
    extended file name server
    efs, extended file name server (Official)
Port: 520/UDP
520/UDP - Known port assignments (4 records found)
  • Service
  • router
    local routing process (on site); uses variant of Xerox NS routing information protocol - RIP
    Routing Information Protocol (RIP) (Official)
  • route
    router routed -- RIP
  • trojan
    [trojan] A UDP backdoor. Backdoor. Works on Unix.

About TCP/UDP ports

TCP port 520 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 520 in the same order in which they were sent. Guaranteed communication over TCP port 520 is the main difference between TCP and UDP. UDP port 520 would not have guaranteed communication as TCP.

UDP on port 520 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 520 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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