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// Other services

Port 4486: Integrated Client Message Service

Port 4486 is assigned by IANA to icms (Integrated Client Message Service).

4486

How icms works

Other services
client:4486icmsresponse client:4486icmsresponse

The client sends a request to port 4486 and the icms 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 4486 dangerous?

We have no specific security note for port 4486. 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 4486

ServicePortTransportDescriptionReferenceUpdated
icms 4486 TCP, UDP Integrated Client Message Service - 2010-09-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 4486, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4486'      # process listening on 4486
sudo lsof -nP -i :4486

macOS

sudo lsof -nP -i :4486

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4486 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4486
netstat -ano | findstr :4486

From another machine

nmap -p 4486 -sV <host>
sudo nmap -sU -p 4486 <host>
nc -zv <host> 4486

Block it in the firewall

sudo ufw deny 4486/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4486" -Direction Inbound -LocalPort 4486 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4486 used for?

Port 4486 is assigned by IANA to icms (Integrated Client Message Service).

Is port 4486 TCP or UDP?

Port 4486 is registered for TCP and UDP.

Is it safe to open port 4486?

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 4486 is open?

On Linux run "ss -ltnup 'sport = :4486'", on macOS "lsof -nP -i :4486", and on Windows "netstat -ano | findstr :4486" to see the local process. From another machine, "nmap -p 4486 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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