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// Other services

Port 4800: Icona Instant Messenging System

Port 4800 is assigned by IANA to iims (Icona Instant Messenging System).

4800

How iims works

Other services
client:4800iimsresponse client:4800iimsresponse

The client sends a request to port 4800 and the iims 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 4800 dangerous?

We have no specific security note for port 4800. 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 4800

ServicePortTransportDescriptionReferenceUpdated
iims 4800 TCP, UDP Icona Instant Messenging System - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4800, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4800'      # process listening on 4800
sudo lsof -nP -i :4800

macOS

sudo lsof -nP -i :4800

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4800 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4800
netstat -ano | findstr :4800

From another machine

nmap -p 4800 -sV <host>
sudo nmap -sU -p 4800 <host>
nc -zv <host> 4800

Block it in the firewall

sudo ufw deny 4800/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4800" -Direction Inbound -LocalPort 4800 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4800 used for?

Port 4800 is assigned by IANA to iims (Icona Instant Messenging System).

Is port 4800 TCP or UDP?

Port 4800 is registered for TCP and UDP.

Is it safe to open port 4800?

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 4800 is open?

On Linux run "ss -ltnup 'sport = :4800'", on macOS "lsof -nP -i :4800", and on Windows "netstat -ano | findstr :4800" to see the local process. From another machine, "nmap -p 4800 <host>" shows whether it is reachable.

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