TCP/UDP Port Finder

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Database updated - March 30, 2016

Search results for "121"

Port: 121/TCP
121/TCP - Known port assignments (10 records found)
  • Service
    Details
    Source
  • erpc
    Encore Expedited Remote Pro.Call
    IANA
  • threat
    [threat] Attack Bot
    Bekkoame
  • threat
    [threat] God Message
    Bekkoame
  • threat
    [threat] JammerKillah
    Bekkoame
  • attackbot
    [trojan] Attack Bot
    SANS
  • godmessage
    [trojan] God Message
    SANS
  • jammerkillah
    [trojan] JammerKillah
    SANS
  • trojan
    [trojan] Attack Bot. Works on Windows 95, 98 and ME.
    Simovits
  • trojan
    [trojan] God Message. Virus / Remote Access / ActiveX trojan / Downloading trojan / Worm / Mail trojan / IRC trojan / Network trojan. Works on Windows 95, 98, ME, NT and 2000, together with MS Internet Explorer 5, MS Outlook and mIRC. Aliases: BackDoor.AB.gen (?), JS.Trojan.WindowBomb
    Simovits
  • trojan
    [trojan] JammerKillah. Anti-protection trojan / Remote Access / Hacking tool / Trojan dropper. Works on Windows 95, 98 and ME.
    Simovits
Port: 121/UDP
121/UDP - Known port assignments (1 record found)
  • Service
    Details
    Source
  • erpc
    Encore Expedited Remote Pro.Call
    IANA

About TCP/UDP ports

TCP port 121 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 121 in the same order in which they were sent. Guaranteed communication over TCP port 121 is the main difference between TCP and UDP. UDP port 121 would not have guaranteed communication as TCP.

UDP on port 121 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 121 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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