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Port 123

Port
Protocol
Service Name
Description
Source
123
TCP UDP
ntp
Network Time Protocol
IANA
123
 UDP
Network Time Protocol (NTP)—used for time synchronization,Official
wikipedia
123
TCP UDP
Network Time Protocol (NTP), Date & Time preferences. Used for network time server synchronization, AppleTV Network Time Server Sync
Apple.com
123
TCP 
Net Controller
emsisoft
123
TCP 
NetController
anti-trojan
123
 
Net Controller
sans.org
123
 
Net Controller
simovits.com
123
TCP 
Madfind
bekkoame
123
TCP UDP
ntp
Network Time Protocol
bekkoame
123
TCP 
Net Controller
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);