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// Other services

Port 2516: Main Control

Port 2516 is assigned by IANA to maincontrol (Main Control).

2516

How maincontrol works

Other services
client:2516maincontrolresponse client:2516maincontrolresponse

The client sends a request to port 2516 and the maincontrol service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2516 dangerous?

We have no specific security note for port 2516. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2516

ServicePortTransportDescriptionReferenceUpdated
maincontrol 2516 TCP, UDP Main Control - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2516, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2516'      # process listening on 2516
sudo lsof -nP -i :2516

macOS

sudo lsof -nP -i :2516

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2516 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2516
netstat -ano | findstr :2516

From another machine

nmap -p 2516 -sV <host>
sudo nmap -sU -p 2516 <host>
nc -zv <host> 2516

Block it in the firewall

sudo ufw deny 2516/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2516" -Direction Inbound -LocalPort 2516 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2516 used for?

Port 2516 is assigned by IANA to maincontrol (Main Control).

Is port 2516 TCP or UDP?

Port 2516 is registered for TCP and UDP.

Is it safe to open port 2516?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2516 is open?

On Linux run "ss -ltnup 'sport = :2516'", on macOS "lsof -nP -i :2516", and on Windows "netstat -ano | findstr :2516" to see the local process. From another machine, "nmap -p 2516 <host>" shows whether it is reachable.

05 Related
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