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// Other services

Port 4846: Contamac ICM Service

Port 4846 is assigned by IANA to contamac_icm (Contamac ICM Service), contamac-icm (Contamac ICM Service IANA assigned this well-formed service name as a replacement for "contamac_icm".).

4846

How contamac_icm works

Other services
client:4846contamac_icmresponse client:4846contamac_icmresponse

The client sends a request to port 4846 and the contamac_icm service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4846 dangerous?

We have no specific security note for port 4846. 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 4846

ServicePortTransportDescriptionReferenceUpdated
contamac_icm 4846 TCP, UDP Contamac ICM Service - 2008-03-20
contamac-icm 4846 TCP, UDP Contamac ICM Service IANA assigned this well-formed service name as a replacement for "contamac_icm". - 2008-03-20

// source: IANA service name and port number registry

03 Check it

Which program uses port 4846, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4846'      # process listening on 4846
sudo lsof -nP -i :4846

macOS

sudo lsof -nP -i :4846

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4846 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4846
netstat -ano | findstr :4846

From another machine

nmap -p 4846 -sV <host>
sudo nmap -sU -p 4846 <host>
nc -zv <host> 4846

Block it in the firewall

sudo ufw deny 4846/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4846" -Direction Inbound -LocalPort 4846 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4846 used for?

Port 4846 is assigned by IANA to contamac_icm (Contamac ICM Service), contamac-icm (Contamac ICM Service IANA assigned this well-formed service name as a replacement for "contamac_icm".).

Is port 4846 TCP or UDP?

Port 4846 is registered for TCP and UDP.

Is it safe to open port 4846?

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 4846 is open?

On Linux run "ss -ltnup 'sport = :4846'", on macOS "lsof -nP -i :4846", and on Windows "netstat -ano | findstr :4846" to see the local process. From another machine, "nmap -p 4846 <host>" shows whether it is reachable.

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