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 "123"

Port: 123/TCP
123/TCP - Known port assignments (6 records found)
  • Service
    Details
    Source
  • ntp
    Network Time Protocol
    IANA
  • ntp
    Network Time Protocol (NTP). Date & Time preferences. Used for network time server synchronization, AppleTV Network Time Server Sync
    Apple
  • threat
    [threat] Madfind
    Bekkoame
  • threat
    [threat] Net Controller
    Bekkoame
  • netcontroller
    [trojan] Net Controller
    SANS
  • trojan
    [trojan] Net Controller. Remote Access / Keylogger / FTP server. Works on Windows 95, 98, ME, NT and XP. Both English and Portoguese versions exists. Aliases: Netcontroller
    Simovits
Port: 123/UDP
123/UDP - Known port assignments (3 records found)
  • Service
    Details
    Source
  • ntp
    Network Time Protocol
    IANA
  •  
    Network Time Protocol (NTP) - used for time synchronization (Official)
    WIKI
  • ntp
    Network Time Protocol (NTP). Date & Time preferences. Used for network time server synchronization, AppleTV Network Time Server Sync
    Apple

About TCP/UDP ports

TCP port 123 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 123 in the same order in which they were sent. Guaranteed communication over TCP port 123 is the main difference between TCP and UDP. UDP port 123 would not have guaranteed communication as TCP.

UDP on port 123 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice. UDP on port 123 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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