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Port 121

Port
Protocol
Service Name
Description
Source
121
TCP UDP
erpc
Encore Expedited Remote Pro.Call
IANA
121
TCP 
JammerKillah, BO jammerkilla
emsisoft
121
TCP UDP
Attack Bot, God Message, JammerKillah (UDP)
anti-trojan
121
 
JammerKillah
sans.org
121
 
Attack Bot, God Message, JammerKillah
simovits.com
121
TCP 
Attack Bot
bekkoame
121
TCP 
God Message
bekkoame
121
TCP 
JammerKillah
bekkoame
121
TCP UDP
erpc
Encore Expedited Remote Pro.Call
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);